tag:blogger.com,1999:blog-2906463626789064900.post3071655462477028368..comments2024-02-27T06:17:58.455-05:00Comments on JE Robison Service - Bosch Car Service Specialists — the blog: The last word on Land Rover liner failures - I hope!John Robisonhttp://www.blogger.com/profile/07407165016025447113noreply@blogger.comBlogger35125tag:blogger.com,1999:blog-2906463626789064900.post-10364930616500721702019-02-03T03:45:51.604-05:002019-02-03T03:45:51.604-05:00im no genius, but i do see some serious imperfecti...im no genius, but i do see some serious imperfections in most of the land rover blocks that link more towards contamination intrusion during casting. the pitting in the casting that you showed had spots of O2 or slag contamination. this type of contamination may render the alloy a lower quality. the lower quality aluminums will expand and contract at different rates as well. so a lean hot cylinder or over heated motor could slip a liner in a poorly cast block. if the soft aluminum expands into the hard steel sleeve thats also expanding back into the block could cause a compression thats only noticeable when its all cooled off. over time this new tolerance could chafe away to a slipped liner. theres nothing stronger than molecular expansion and contraction.Anonymoushttps://www.blogger.com/profile/05020554652287867598noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-71649911782020380622017-10-07T12:43:17.122-04:002017-10-07T12:43:17.122-04:00this is a great blog and and I've read almost ...this is a great blog and and I've read almost every post. It seems to me you're saying that these LR's are not for the faint of heart. EVEN if you were to purchase one w/ a rebuilt engine (flanged liner) and you purchased the 1999-2000 model to get the stronger frame, it's STILL going to have a good chance of frame failure??<br /><br />I purchased a 2007 LR3 w/ a warranty!! So far, the dealer (at no cost to me, beyond the inital outlay) has replaced both differentials, a compressor, two struts (front), intake manifold (I had the fuel correctly serviced at that time) (hopefully), tie rod ends (twice??); sun roof drain hose, and a varmint chewed into the heater box.<br /><br /><br />the warranty runs out in 9k miles. any thoughts, should I look for the elusive 1999-2000? or should I look at the 2008 as a keeper.<br /><br />the parking brake thing is looming, but frankly that fix sounds cheap compared to these disco engine problems.....<br /><br />btw, my LR3 is super nice, good interior, no dents, dash is still in one piece, no codes etc.<br /><br />bzw<br />Anonymoushttps://www.blogger.com/profile/06950621310815336716noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-47143782701794296402017-05-29T19:54:33.779-04:002017-05-29T19:54:33.779-04:00Are there other engines made by other auto manufac...Are there other engines made by other auto manufacturing companies that can be used as a replacement for a Bosh engine in a 2000 Discovery II?Les Blevinshttps://www.blogger.com/profile/13872785203404195597noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-8011261081718691522017-01-07T06:21:37.957-05:002017-01-07T06:21:37.957-05:00Hi mate. Presumably as motor cools coolant would b...Hi mate. Presumably as motor cools coolant would be drawn into the Crack and up into the pot. So when whipping the heads off a motor with such a Crack would you see traces of coolant between liner and casting? Cheers Anonymoushttps://www.blogger.com/profile/13416905496315806198noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-69357398297006513052016-09-18T09:07:01.704-04:002016-09-18T09:07:01.704-04:00Hi notny41 (and all)
Running a '97 3.9 on lp...Hi notny41 (and all) <br /><br />Running a '97 3.9 on lpg with a blower - a brave and rare mix for sure - bought it recently for occasional / hobby towing and 4x 4 jaunts. Drives well and pulls hard but slight tapping noise under load - goes away when light cruise, on overrun, or idle. No coolant use or pressurisation. Too light for big end I reckon, sounds like piston slap but usually that's worse when cold and unloaded imo, so might not be this? Not lifter noise either, not a tapetty sound. Could it be this, was thinking manifold leak maybe as apparently one branch leaking can sound like a tapping type noise....<br /><br />Cheers <br />Stuart Perth AustraliaAnonymoushttps://www.blogger.com/profile/06837432720131832567noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-61897940372307161602016-08-11T09:02:23.750-04:002016-08-11T09:02:23.750-04:00Hi John, I have a 1996 Disco SE and it just starte...Hi John, I have a 1996 Disco SE and it just started making this ticking noise - my disco runs cool (never gets past halfway on my temp gauge) - are you saying this is likely not a slipped liner? https://www.youtube.com/watch?v=hBhlj3HO1NsAnonymoushttps://www.blogger.com/profile/07958702019836530018noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-63858087390283705242016-06-03T16:14:18.592-04:002016-06-03T16:14:18.592-04:00Hi John .......great article. I have a TVR CHIMERA...Hi John .......great article. I have a TVR CHIMERA4.0 v8 it has a very slight rattle .....example after blipping throttle as revs die then rattle.....is this piston skirt slap or cam rattle or slipped liner?<br />I did like the reply from the guy who knurled the skirts to retain oil!!<br />Andy uk.......nealeandrew@outlook.com<br />V8matehttps://www.blogger.com/profile/00675579568853124663noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-37424056552500537972015-12-06T17:43:39.748-05:002015-12-06T17:43:39.748-05:00Ross, the 2000-2003 Range Rover motors seem almost...Ross, the 2000-2003 Range Rover motors seem almost as problematic as the 2003-4 Discovery engines. They are better as they get older, but I can't quantify that, and as the years pass, age works against us such that a motor that might otherwise be good is now likely simply worn out.<br /><br />And in the case of a worn out Land Rover V8, I don't think I would rebuild any of these engines without conversion to flanged liners.<br /><br />If you asked what the most reliable motors would be, I would say the 1999-2000 4.0 engines in the Range Rover or Discovery II. And it's very hard to find good examples of either here in New England.John Robisonhttps://www.blogger.com/profile/07407165016025447113noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-5772242465014332302015-12-06T14:37:52.308-05:002015-12-06T14:37:52.308-05:00Thank you for sharing your knowledge super post. M...Thank you for sharing your knowledge super post. My question is the same as the first poster in April 2010; I didn't see an answer: do you find failure of the block wall in 2000-2002 Range Rovers or just 2003-2004 Discos? Or another way to pose the same question: if I'm looking for a 4.6, what year/model might have most longevity without either post 2000 failure of the block or pre 2000 slipped sleeves? Many thanks!Rosshttps://www.blogger.com/profile/15032387776534813604noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-91093311494432409312015-10-29T21:38:49.601-04:002015-10-29T21:38:49.601-04:00Simon, we grind into cracked areas, and fill with ...Simon, we grind into cracked areas, and fill with weldJohn Robisonhttps://www.blogger.com/profile/07407165016025447113noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-51832378844553044582015-10-29T18:27:09.964-04:002015-10-29T18:27:09.964-04:00Hi John.
In your spec you mention you repair any ...Hi John.<br /><br />In your spec you mention you repair any cracks found before relining the block. What method do you use for the repair?<br /><br />ThanksSimonhttps://www.blogger.com/profile/16163286393768716950noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-59221268243842921092015-09-21T14:43:38.463-04:002015-09-21T14:43:38.463-04:00Continued operation with a blown head gasket will ...Continued operation with a blown head gasket will damage the block deck. Park it till it's fixedJohn Robisonhttps://www.blogger.com/profile/07407165016025447113noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-60652856712151110742015-09-21T14:31:23.294-04:002015-09-21T14:31:23.294-04:00Hi john , I have 2000 d2 with external combustion...Hi john , I have 2000 d2 with external combustion leak out the side of head ( sounds like a cho cho train . I've narrowed down to cyl 6 , could I pull that injector and spark plug to avoid further damage to block or will that fry other components ? Just a thought ... Thanks ... Anonymoushttps://www.blogger.com/profile/10748226627241051581noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-62458622060114099172015-07-10T10:44:09.806-04:002015-07-10T10:44:09.806-04:00What great Write Up I recently Purchased an 04 D...What great Write Up I recently Purchased an 04 Discovery II with 4.6 Engine I have the exact same Noise issue going on. What are my options? New Engine and from Where?, Rebuild the Engine? What is the quickest way to fix this issue without spending an arm and a leg?<br /><br />Any Suggestions Email me Please...Anonymoushttps://www.blogger.com/profile/09685416117901725351noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-12869526781385861122015-02-04T07:15:24.865-05:002015-02-04T07:15:24.865-05:00These cracks are only a few thousandths wide, if t...These cracks are only a few thousandths wide, if that. They expand under heat and pressure but in any case you are not going to force a substance as thick as JB Weld into a space like that.<br /><br />So I've never tried what you say but doubt very much it would work. John Robisonhttps://www.blogger.com/profile/07407165016025447113noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-77325180996320181902015-02-03T22:34:49.560-05:002015-02-03T22:34:49.560-05:00Hello Mr. Robison, I may have the issue with the c...Hello Mr. Robison, I may have the issue with the crack behind the liner - do you think one could remove a stud and pressure test thru that hole, then if finding it leaking, pump JB Weld into the crack with the excess going around the liner? Regards, KeithKennethhttps://www.blogger.com/profile/05693873115124827009noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-5695008554892731872014-09-06T22:58:25.729-04:002014-09-06T22:58:25.729-04:00Hi John, you mentioned secondary air valve failure...Hi John, you mentioned secondary air valve failure caused a rapping noise. Can you explain this in more detail? Also you mentioned rocker and lifter issues causing the rapping to fade in and out. My 2004 Disco with the secondary air system raps when hot, and also under load fading in and out. It also fades in and out at idle, and sometimes i won't hear it at all for days, and sometimes it just won't go away. I also know notice the performance is much more smooth when its not making noise. Some advice wold be great. Thank YouAnonymoushttps://www.blogger.com/profile/02290080051161237326noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-48190055917971137692013-11-10T21:40:42.436-05:002013-11-10T21:40:42.436-05:00fantastic publish, very informative. I ponder why ...fantastic publish, very informative. I ponder why the other<a href="http://www.technobritish.com.au///" rel="nofollow">land rover specialist brisbane </a> of this sector don't realize this. You should continue your writing. I am sure, you have a great readers' base already!<br />Anonymoushttps://www.blogger.com/profile/10125228722406955109noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-34792289873491335582012-11-13T05:52:36.655-05:002012-11-13T05:52:36.655-05:00Rachel, we have recently changed to a liner that i...Rachel, we have recently changed to a liner that is sealed with an o-ring at the bottom for the very reason you cite.John Robisonhttps://www.blogger.com/profile/07407165016025447113noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-39729127471792232632012-11-12T23:19:46.916-05:002012-11-12T23:19:46.916-05:00Hi John, Thanks for taking the time to share your ...Hi John, Thanks for taking the time to share your expert knowledge on this topic. I have a 2003 Disco and have had a LR V8 specialist here in Australia install a 4.6 with stepped liners in to it due to the original 4.0 having slipped liners and pressurised cooling system due to crack in block. Then 4.6 engine ran fine for 40,000kms and then developed a coolant leak from behind the liner down into the sump. The engine on liquified petroleum gas (LPG) via a Landi Renzo sequential gas injection system. The LR specialist who built the engine claim that the leak is due the block cracking behind the liner, caused by very high combustion temperatures in the cylinders due to the engine running on LPG. I have also since had the ARP head stud nuts come loose and cause a head gasket leak. Again, the mechanic is blaming the high combustion temps of the LPG as the cause of the nuts loosening.<br />Do you believe the LPG could be the culprit of both failures? Also, would not a properly installed stepped liner create a good enough seal so as to not allow coolant to leak from a crack down into the sump? I am interested to here an indipendant point of view. Many thanks, Russ.Rachelhttps://www.blogger.com/profile/07404674017349300572noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-71258688505390067382012-08-08T06:52:56.762-04:002012-08-08T06:52:56.762-04:00Mbrosch, if you refer to the photos in the article...Mbrosch, if you refer to the photos in the article you will see the answer to your question "why not pin the sleeves in place".<br /><br />The answer is that the blocks crack behind the sleeves and combustion gas gets into the coolant passages. Pinning won't help that. The second problem is that nothing seals the liner to the head gasket, and pinning won't help that either. Flanged liners are the only thing anyone has found to address those problems.John Robisonhttps://www.blogger.com/profile/07407165016025447113noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-45682230494778615062012-08-08T03:07:58.258-04:002012-08-08T03:07:58.258-04:00Interesting; mostly because i brought home a sick ...Interesting; mostly because i brought home a sick 2001 Disco today and have plans to heal the beast. During the trek of 18 miles I used 4 gallons of water to keep the temp under control and have convinced myself that the engine is likely blasting combustion pressure into the cooling system, but haven't gotten the heads off yet to diagnose the problem.<br />regarding noise: I have been a mechanic the better part of my life and I was very interested in your views regarding the noise you have experienced and evaluated in these engines. Today, when the engine was hot, I heard the unmistakable sound of lifters which had lost their prime as a result of a loss of oil viscosity. The fix is easy enough: reduce the coolent temp and the oil will be able to do it's job; but I would like to pose the following. Suppose you did, in fact, have sleeves "hammering?" it seems to me that you could drill a few holes around the bottom of the sleeve and pin the thing in place with a few tapered dowel/wedges. Nothing actually happens down there anyway except that the skirt prevent the piston (which is drilled off center) from slapping the cylinder walls. <br />In the old days we would knurl noisy pistons on the skirts (on the lathe), tap them back into the bores and expect an easy 30k miles life extension. When I was a BMC race mechanic at Laguna Seca, We would knurl new pistons, then reduce them to the bore size, just to give oil a place to live. <br />Anyway, it was great to read the musing of an actual mechanic/machinist and not just some "bolt on kid." <br />SO: pin he sleeve, knurl the piston, Use a bit heavier oil for the valve lifters..<br /> Why not?mbroschhttps://www.blogger.com/profile/01061637105972138846noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-13824949997008608412012-05-26T02:14:00.771-04:002012-05-26T02:14:00.771-04:00nice blog.
Dev Precision Engineers is the brand th...nice blog.<br />Dev Precision Engineers is the brand that is synonymous with the export and manufacture of Engine spares and parts <a href="http://www.globalautomotive-industry.com/products-services/engines-and-engine-components/dev-precision-engineers/" rel="nofollow">CYLINDER LINERS AND SLEEVES</a>.Lassiahttps://www.blogger.com/profile/14575625586876985582noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-41033045355581509492012-04-09T11:51:37.078-04:002012-04-09T11:51:37.078-04:00Yes, Buffalo, that's how they soundYes, Buffalo, that's how they soundJohn Robisonhttps://www.blogger.com/profile/07407165016025447113noreply@blogger.comtag:blogger.com,1999:blog-2906463626789064900.post-47148364111274970472012-04-09T11:47:01.269-04:002012-04-09T11:47:01.269-04:00Great article
Question on the "hot Rap"...Great article<br /><br />Question on the "hot Rap" - my 04 Disco is quiet until it warms up, then very loudly raps at idle/gas pedal release, but is quiet under load/accelerating<br /><br />After my last oil change the sound actually went away for a few days, but then slowly came back (oil level is good, using full synth)<br /><br />The clues here: going away after oil change, no sound when engine is cool, and rapping only during idle/unloaded have me baffled<br /><br />It has been going on for quite awhile. I expected a thrown rod, but so far I only get the noise<br /><br />Does this fit the piston skirt issue?<br /><br />Thanks!Buffalohttps://www.blogger.com/profile/03064318507933027602noreply@blogger.com