Timing cover bolts on L67 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-20-2012, 09:16 PM   #1
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Default Timing cover bolts on L67

Hey guys, I dropped my motor off to the machine shop to have them bore the cylinders and mill the head surface. However I didn't know that they would not reassemble the engine afterwards, and now I have an assortment of bolts unorganized. I went to the dealership and checked out their catalog of what is supposed to go where and so now I am at the timing cover. I've determined that 5/16'' bolts go on the front of the engine and 8mm go on the rear main seal housing. Here is the information the dealership gave me:



So I am having trouble deciphering the stuff in between the lengths such as why call# 332 has a 2.75 and a 3.07 length. Also not sure what 2AX1.50 means for #334 and what full 1.0 THD 300M PO means. Nonetheless it'* not terribly important to me. Here are all the 5/16 LONGER bolts I could find (tested with a 5/16 nut) and I am assuming these all go to the timing cover.



I also found these smaller black 5/16 but I'm not sure if any of these go to the timing cover as well, or where they go for that matter.



In any case I really appreciate anyone'* help. This is a project thats been going on for almost a year and a half and I just want to finish it!
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Timing cover bolts on L67-ac4k9.jpg   Timing cover bolts on L67-j1ql7.jpg   Timing cover bolts on L67-rzgpm.jpg  
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Old 03-20-2012, 10:31 PM   #2
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310 is the 2 shorter ones with the funny heads, 333 is the lone one.

The short ones with the big heads are for the flex plate.
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Old 03-20-2012, 11:08 PM   #3
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What about the long one with the funny head? I'm guessing that is 332?

And the remaining long ones (top row) are 334,335?

Also, if you notice, there are two short, big head bolts with washers at the end. These ones are slightly longer. Are they for the balancer shaft retainer?
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Old 03-20-2012, 11:09 PM   #4
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By the way, THANK YOU VERY MUCH!! (in advance)
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Old 04-16-2012, 04:45 PM   #5
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So I noticed that the snaps on the bottom front cover bolts are meant to hold a plastic retainer for the harmonic balancer. How important is this retainer? Some of the portions where it connects to the snap seemed to have broken off when the engine was first disassembled, so I am trying to get a sense whether it'* worth installing or even getting a new one and what harm could arise by not using it.
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Old 04-16-2012, 06:16 PM   #6
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Helps keep the dirt away from the sensor. And also holds the cam sensor wire away from the harmonic balancer. See if you can stick it in place with some RTV on the clips.
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Old 04-21-2012, 06:24 PM   #7
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I just noticed that my timing cover gasket kit came with 4 o-ring seals. I have looked at the diagrams in the FSM some 10 times but I don't see them anywhere. What are these for?

Here is an image of the felpro kit on amazon, the bottom 4 seals are the ones I am looking at:
http://ecx.images-amazon.com/images/...LL._SS500_.jpg
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Old 04-21-2012, 07:25 PM   #8
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Most likely for the coolant elbows.
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