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Automotive Necromancer
Join Date: Nov 2006
Location: Beantown, MA
Posts: 1,544
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marks
the thing is...the timing "marks" on the cam gears are really only for "rough" timing. It is possible that if you were to set the cam gear on the second bank to the timing mark, you may actually be off. (I know, I know, It IS counter intuitive...BUT, what can ya do?) IF it was my car or in my shop, I would try 1 tooth either way, assuming again, that the cam gear hasn't been moved relative to the camshaft. A few turns by hand to check and make sure the valves aren't hitting anything...Then a compression test...IF ok, cross your fingers and try to start her up. If the Cam to cam gear timing has slipped...all bets are off.
A handful of patience is worth more than a bushel of brains.
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There may be nothing quite as expensive as a cheap Porsche: Ruby Red 84 928S : White 87 924s 2.5L NA (Blinky) M44/07-43H10676 spoiler delete - 046/2B - Belts 9/12, Clutch and OC seals 8/08 andd Red 94 Del Sol: Please put your Make, Model and Year in Sig. Try not to break more than you fix. |
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03-23-2009, 07:12 PM
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What's whacked out is the no compression on one side. At first I would of said the lost of power could of been a knock sensor (I believe that year has them not sure) but makes me think now that the internal cam skipped a tooth which is hard. that engine has four cams and two are external, the external ones run the internal ones by chains. I believe one cam side does intake and the other one does exhaust there for no compress if one side is open. All and all you never know but very odd if it to happen.
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03-23-2009, 08:12 PM
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Network Native
Join Date: Jan 2007
Location: SoCal
Posts: 10,349
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You might as well start with a careful check of the cam timing. If it was mine I would have the Jack Kelly manual and Porkens 32vr to do it.
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03-23-2009, 08:57 PM
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Join Date: Mar 2009
Posts: 18
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I got the head pulled out, it was 8 bent intake valves.
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03-24-2009, 03:20 PM
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Join Date: Mar 2009
Posts: 18
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That is as far as i went. Is it possible more damage may have occurred internally? Ill be taking the head to the machine shop today. Anyone have the camshaft positioning tools for sale or perhaps better yet in Phoenix to loan out. One last question, Do I need to replace the cylinder head bolts and washers when reinstalling the head?
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03-24-2009, 03:27 PM
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I heard that the pistons can get messed up too when this happens if it does it at high speeds. "how do they look"
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03-24-2009, 05:57 PM
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Automotive Necromancer
Join Date: Nov 2006
Location: Beantown, MA
Posts: 1,544
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Ouch!
8 intake valves? wow. That is pretty much all of em for that side. Sorry to hear about it. Post a couple of pics of the cylinders if you want a good guess as to damage. It is really up to you to determine. Clean it up really good and think about magnafluxing in place to check for cracks. Were the valves just kinda "grazed" or were they really badly mashed? Lets all hope 8 valves is the extent of the damage.
__________________
There may be nothing quite as expensive as a cheap Porsche: Ruby Red 84 928S : White 87 924s 2.5L NA (Blinky) M44/07-43H10676 spoiler delete - 046/2B - Belts 9/12, Clutch and OC seals 8/08 andd Red 94 Del Sol: Please put your Make, Model and Year in Sig. Try not to break more than you fix. |
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03-24-2009, 09:53 PM
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Registered
Join Date: Jan 2009
Location: Austin TX
Posts: 9
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After aligning the cam sprocke marks you must then turn the crank to TDC #1. Lock the crank then install your belt.
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03-28-2009, 07:39 PM
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Join Date: Mar 2009
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The shop said the head was in good shape. Roughly 500 dollars to replace the valves. As for the pistons, they don't look to bad but i ll post some pics. Someone with a more experienced eye may tell me different.
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03-28-2009, 09:00 PM
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Network Native
Join Date: Jan 2007
Location: SoCal
Posts: 10,349
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Pelican sells the TRW version of the intake valves, 928-105-641-01 $18.75, make sure the guides are replaced as well.
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03-28-2009, 10:53 PM
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