Paul
Posted a lot
Posts: 1,909
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Jun 28, 2013 10:41:01 GMT
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'if it ain't broke then fix it 'til it is'. Did a wet test - instantly compression shot up to 205/200/200 across cylinders 1/3/5 respectively. so what makes you think timing and not bottom end ? Umm...Google?  Apparently if one tensioner is off that can affect one bank only, and even half a tooth out would generate poor compression readings. I'm thinking timing because I want it to be timing - that's about £200 in parts and a lot of faffing. I've found one explanation I don't mind...just trying to explain why it would be 3 cylinders all on one bank. On the other hand, it would be £200 wasted if it's not the cam chains... If it's the bottom end that's a lot more pricey...rebores, rings, etc etc Thing is, I've a suspicion the chains haven't long been done, but I haven't got the paperwork to hand. Is there a way to confirm without dismantling most of the car? Would a leakdown test confirm poor timing? Am confuse. |
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Last Edit: Jun 28, 2013 10:52:50 GMT by Paul
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Jun 28, 2013 12:30:12 GMT
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I can't see it being cam timing unless the sprocket has moved on the end of the cam, looks easy enough to check though, imo both "banks" would be wrong if the tension was out/incorrect. All you need is some flat plate just like the diesel VW engines, and line the crank up. www.gruvenparts.com/website/diys/timing_chains_replacement.htm |
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Jun 28, 2013 13:25:10 GMT
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If a wet test made them shoot up, it's the rings, no?
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RobinJI
Posted a lot
"Driven by the irony that only being shackled to the road could ever I be free"
Posts: 2,995
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Jun 28, 2013 16:28:18 GMT
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If a wet test made them shoot up, it's the rings, no? I was thinking this. When you did the wet test, did you do all 6 cylinders or just the 3 that were down? |
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ChasR
RR Helper
motivation
Posts: 10,195
Club RR Member Number: 170
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Jun 29, 2013 18:51:36 GMT
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I am with PhllipM and Merion (Welshpug) here.
Cam timing IME would not affect the compression readings that much, but even if it could the fact that the wet test has made the pressures shoot up to a more agreeable value with the other bank (in addition to the fact that these engines are not unknown for wearing the bores past 100k) would make me suspect bores, since that is the purpose of the wet test.
A leakdown test would show where the issue is yes.
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Last Edit: Jun 29, 2013 18:52:38 GMT by ChasR
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Paul
Posted a lot
Posts: 1,909
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Jun 29, 2013 19:59:21 GMT
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Cheers guys...I think I've sourced a good engine for less than the price of getting a leak down done. Can take apart the old one to inspect later.
Not quite sure how to explain this to Mel though...
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Not quite sure how to explain this to Mel though... No one will really want to touch that Cost avoidance only works for so long and we all get found out!!! |
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Contrary to popular opinion, I do have mechanical sympathy, I always feel sorry for the cars I drive.
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hairymel
Club Retro Rides Member
avatar by volksangyl
Posts: 1,081
Club RR Member Number: 207
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notsoswift - Paul doesn't have to explain his finances to me as i am just his workshop curse word buddy  i think what paul is implying is that my 2 month long unit tidy may be somewhat negated by scattering engines and bits of corrado everywhere  paul - the cats out of the bag now  not really a surprise to me, i know how much you love an engine removal  ....it's your responsibility to find a way of wedging everything in the unit though  ps afaik a leakdown test costs the price of an old spark plug and a bit of fudging  |
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whats that burning smell?
oh curse word :-(
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Apparently if one tensioner is off that can affect one bank only, and even half a tooth out would generate poor compression readings. 
