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Unread 06-28-2014, 05:10 PM   #1
djordan6319
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1991 YJ Wrangler 
 
Join Date: Jul 2012
Location: xenia, ohio
Posts: 50
Help with timing

I have a 95 YJ with the 2.5 when i bought the motor it had sat for 2 years so i went through and replaced some things including the timing chain and gears....what i am needing help with is when i started at TDC the timing marks are pointing at each other on the inside then you turn the gear until the cam is at the 1oclock position and the crank is at 3 oclock and there are 20 pins between the two timing marks.....it now has valve clang at highway speed anything over 40 as if it was a tooth off.....so I took everything back apart and checked it...when i put the two gears with the timing marks pointing at each other the distributor is now pointing at the #4 position as if it is 180 out but if i turn the motor one more time the distributor is at number one and my timing marks on the crank is at 12 and the mark on the cam is at 12 like the cam is 180 out at this point everything is TDC but the cam

Is this right or do i need to adjust the cam

Thanks

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Unread 06-28-2014, 09:57 PM   #2
Gausswave
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1989 YJ Wrangler 
 
Join Date: Jul 2013
Location: Bellevue, WA
Posts: 166
Being 180 out is ok for half the cycle. Think about the ratio of teeth between the cam and the crank and it should make sense. The only way I can think the timing ( crank vs. cam )would be off like that is if the crank gear is on backwards. Looking at the crank the key should be at 12:00 and the mark should be about 10:00.
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Unread 06-29-2014, 08:22 AM   #3
Mike Romain
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You need TDC on the compression stroke. As you noted, there are 2 TDC's in the cycle. You find it by having your finger over the plug hole as you hand turn the engine over. When it comes up on the right TDC, you can feel it.
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Unread 06-29-2014, 05:49 PM   #4
laybackman
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Quote:
Originally Posted by djordan6319 View Post
I have a 95 YJ with the 2.5 when i bought the motor it had sat for 2 years so i went through and replaced some things including the timing chain and gears....what i am needing help with is when i started at TDC the timing marks are pointing at each other on the inside then you turn the gear until the cam is at the 1oclock position and the crank is at 3 oclock and there are 20 pins between the two timing marks.....it now has valve clang at highway speed anything over 40 as if it was a tooth off.....so I took everything back apart and checked it...when i put the two gears with the timing marks pointing at each other the distributor is now pointing at the #4 position as if it is 180 out but if i turn the motor one more time the distributor is at number one and my timing marks on the crank is at 12 and the mark on the cam is at 12 like the cam is 180 out at this point everything is TDC but the cam

Is this right or do i need to adjust the cam
Thanks
Here is how it should align. The pin on the crank and the keyway on the crank gets your crank/cam aligned.



Are you sure you have your distributor in properly?
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