sharma187 0 Posted February 9, 2014 Report Share Posted February 9, 2014 hi guys wonder if i could get come help here. was driving along in the mk3vr6 as you do when all of a sudden it started misfiring. got to a set of traffic lights and the engine started to sound very tapety like low oil, i then drove home as i was like 2 minutes away and the red oil light comes on... turns out the rod that drives the pump snapped. Ive replaced the pump and shaft but for some reason its still missing. wait for it... i checked spark and fuel all was fine and dandy, checked compression all was good however… number 2 cylinder has zero compression…I'm struggling to understand why this is. i was advised to try changing the tappets as it was pretty noisy anyway. so i changed all 12 tappets but its still the same. any ideas of what this could be. i don't think its possible for valve damage to occur but i may be wrong.. I'm yet to put oil in pot number 2 and see if it builds compression. any help would be great. thanks Link to post Share on other sites
Jakeyb 23 Posted February 9, 2014 Report Share Posted February 9, 2014 well really id do a dry test n a wet test... if valves and pistons havent clashed then it maybe hard to imagine major damage but low oil pressure means the cams could be damaged .. the valve guide could be damaged casuing it to stick and not open or close.. do you have access to a bore scope? u can buy a cheap version from somewhere that sells insulation normally aswell... for you too see the oil light im afraid it would indicate low oil pressure and thats never good for an engine .. so , dry test, wet test... then leak down test ( filling the cylinder full of pressurized air) and see if it shows signs of leaking. can buy a kit of ebay for around £30 sharma187 1 Link to post Share on other sites
sharma187 0 Posted February 9, 2014 Author Report Share Posted February 9, 2014 Ok thanks will try that. I'm just a little confused as to how it would be possible for valve damage to occur. Any thoughts? Link to post Share on other sites
andymk312v 15 Posted February 9, 2014 Report Share Posted February 9, 2014 Low oil pressure could cause the chains to come slack and jump a tooth.Have you checked the timing marks? Link to post Share on other sites
UnitedMotorsport 55 Posted February 9, 2014 Report Share Posted February 9, 2014 You drove for at least 2 minutes with ZERO oil pressure - that engine is nothing other than scrap. Jakeyb and michael5556 2 Link to post Share on other sites
sharma187 0 Posted February 9, 2014 Author Report Share Posted February 9, 2014 Hmm...worst thing is it's just been rebuilt less than 1k miles ago ! Link to post Share on other sites
sharma187 0 Posted February 9, 2014 Author Report Share Posted February 9, 2014 Yep timing is spot on. Link to post Share on other sites
andymk312v 15 Posted February 9, 2014 Report Share Posted February 9, 2014 As united says, engine will be fucked. Link to post Share on other sites
UnitedMotorsport 55 Posted February 10, 2014 Report Share Posted February 10, 2014 Hmm...worst thing is it's just been rebuilt less than 1k miles ago ! Who rebuilt it? Link to post Share on other sites
sharma187 0 Posted February 10, 2014 Author Report Share Posted February 10, 2014 A guy I know does v dubs strictly. Rebuild was done over a year ago. motor is hardly driven. Link to post Share on other sites
sharma187 0 Posted February 10, 2014 Author Report Share Posted February 10, 2014 Anyone know where I will be able to source a reliable second hand lump? Link to post Share on other sites
Daverse 175 Posted February 10, 2014 Report Share Posted February 10, 2014 forums or if worse comes to worse... ebay Link to post Share on other sites
Jakeyb 23 Posted February 10, 2014 Report Share Posted February 10, 2014 strip that one , get him to check it for tolerance's .. if its in spec just re build that one .. dont buy a second hand lump its jsut someones lese problems Link to post Share on other sites
CALICO 130 Posted February 11, 2014 Report Share Posted February 11, 2014 You could buy my Vr6 with 93,000 miles on it use the engine and sell the rest only £1000 headgasket and timing chains replaced last year Link to post Share on other sites
sharma187 0 Posted April 17, 2014 Author Report Share Posted April 17, 2014 How's it going guys. Got to the bottom of the situation. Friend left his car with me so I checked timing and it was out! Thanks audimk312v! Looks like oil pump failed so obviously the timing chain tensioner was no longer being fed with oil causing chains to go slack and jump. In the end cylinder 2 intake valve was bent ever so slightly and the valve spring broke. Had the head skimmed and put it back together now she runs like a dream. Thanks for help anyway guys. Just goes to show with a little investigation i managed to save him a few. Link to post Share on other sites
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