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mick · Joined: 13 Jun 2003 Posts: 183 Location: ohio

ok if you dont remeber me and my problems ill give you a short back ground. 3 months ago i was changing my timing belt and didnt line up my timing marks well thats bad real bad. how bad you ask .well i bent all 8 valves bad. i found a local porsche mechanic of 36 years that said he would take it home and fix it for around 400 dollars.in 1 week. well that was 3 months ago i just got it back this morning also it cost me 1000 dollars because the buckets had to replaced. expensive little buggers. 50 bucks each. while i have no faith at all in this guy, the head does look great . so this is the new problem.... i put it on ealry this morning every thing went smooth until it was time to line up my timing marks. and discoverd that when the mark on the crank is lined up to TDC, the cam will not line up. vice versa when the cam mark lines up the engine wont. you can hear the piston hit the valves and stop. it in no way at all will line up together. roll the engine past TDC and then set the cam and kick the engine back again dosent work. the guy said its the same thickness gasket the same length valve. what in the crap could it be guys. could it be real poor valve adjustment. could it be im slightly stupid and missing something simple . oh god help. im hating this car more and more. also its a '80 931 thank you

kaffine · Joined: 13 Jun 2003 Posts: 644 Location: Las Vegas

Try postioning the crank so the pistons are about half way up in the cylinders. Set the cam in the correct position then rotate the crank the same way it normally rotates to line up the timing mark.
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80 924
80 931

The best desciption of an atom boils down to something unknown is doing we don't know what.
Sir Arthur Eddington

mick · Joined: 13 Jun 2003 Posts: 183 Location: ohio

i tried that it still hits. i was just looking at it and when the cam gear is lined up with my mark the #1 intake valve is all the way open. that isnt right is it shouldnt the intake and exhaust both be closed?

Joes924Racer · Posted: Sun Aug 31, 2003 11:47 am Post subject:

Your doing something wrong, my understanding is put the craNK MARK ON ITS MARK then put the cam on its mark and it shoud work wonder if the valves are the right ones they might be to long eh.

_________________
1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.

Paul · Posted: Sun Aug 31, 2003 11:54 am Post subject:

What marks are you using on the crankshaft and camshaft?

Is your camshaft gear installed properly?

Pictures would help.

mick · Joined: 13 Jun 2003 Posts: 183 Location: ohio

im using the timing marks on the oil pump and the one on the valve cover. i have no pics sorry. i did notice that when the timing mark on the cam is lined up the intake valve on #1 is all the way open that isnt right is it shouldnt both be closed??

Joes924Racer · Posted: Sun Aug 31, 2003 12:19 pm Post subject:

Iunderstand that its a interference engine and a little more complicated
take the time to make sure your doing things right ,if it[#1 cyl. piston is supposed to be at TDC then are not the valves on #1 to be both closed.

_________________
1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.

mick · Joined: 13 Jun 2003 Posts: 183 Location: ohio

when the cam mark is lined up the intake valve on #1 is as far open as it gets how could that be? how could the cam and gear change?

Roger · Joined: 06 Jan 2003 Posts: 1235 Location: Cordova, TN

I have never done this procrdure so excuse me if I am wrong.

If the timing bent is not installed then the crank and cam turn independantly. It sounds like your timing belt is installed. If so remove it line up the marks and then put the belt back on.
_________________
1981 924 NA

Some people are like Slinkies. Not really good for anything, but you
still can't help but smile when you see one tumble down the stairs.

mick · Joined: 13 Jun 2003 Posts: 183 Location: ohio

no the belti is not installed they do turn independintly. but just dont corrolate with each other...

Paul · Posted: Sun Aug 31, 2003 12:55 pm Post subject:

Please tell me exactly what you are using as timing marks for the Camshaft.

Also verify that the flywheel timing marks agree with your oil pump marks.

mick · Joined: 13 Jun 2003 Posts: 183 Location: ohio

yes paul the fly wheel mark is on z1 which is lined up on the crank(TDC). on the cam im using the dot on the cam gear and the pointer on the valve cover. but when they cam mark lines up the #1 intake valve is all the way open , and from what i understand thats not right. RIGHT?

Joes924Racer · Posted: Sun Aug 31, 2003 1:06 pm Post subject:

yea thats what I was gonna say next check the flywheel marks
this is silly

_________________
1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo.

Paul · Posted: Sun Aug 31, 2003 1:06 pm Post subject:

Check to make sure the camshaft woodruff key is installed, it sounds as if your camgear is not installed properly.

mick · Joined: 13 Jun 2003 Posts: 183 Location: ohio

well to make it worse the cam gear is backwards the dot faces the nose of the car not the rear. silly yeah you arent kidding. i havent checked the woodruff key but if the gear bolt is loosened wounldt the gear turn on the cam?