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Resolved 2G Water pump bolt will not fit!

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farmer890

Proven Member
123
29
Apr 26, 2014
A, AB_Canada
Hello all. What I am trying to do is install my new water pump onto my 7 bolt 4G63 which is on an engine stand. I ordered new water pump bolts from STM (here) because I couldn't find my old bolts from when the engine was taken apart.

There are 5 bolts total. It's really obvious where 2 of them go, the longest one and the shortest one. That leaves the remaining 3. Of the remaining 3, 2 are the same length and the last one is slightly shorter. I am unsure of the specific lengths of these bolts as I seem to have misplaced my measuring tape.

My issue is that when I am tightening down the bolts, the one on the very bottom of the water pump will not tighten all the way. It seems to "bottom out" in the block before the head of the bolt is even close to the water pump itself. I have tried every possible combination, switching bolts around, and I keep running into the same issue. Every bolt tightens up snug except the bottom bolt. I inspected the block holes, but they were of course perfectly clean as I had the block hot tanked etc.

I am beginning to think the guys over at STM sent me at least 1 bolt that is too long. Has anyone had this issue or does anyone know the proper lengths and locations for each specific bolt? All my searching pulls up really old threads that don't seem to answer my question and are cluttered as hell.

Edit: So the bolt I need is an M8 x 1.25 22mm. The bolt STM gave me in their kit is like 4mm too long. Unbelievable.
 
Last edited:
Forget the block for a moment, when you have all the bolts in the correct place, they should stick out of the water pump the same amount.

Found this on 4g61.org - should be the same.

That diagram is for a 1G. For a 2G...

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Well I got a different bolt that fits and torqued them all according to the 1G diagram. Are the torque specs different for the water pump to block bolts between 1g and 2G?
 
They aren't exactly the same but not different enough to matter.

Where the 1G diagram shows 9-10 ft.-lbs., the 2G shows 8.7-11 ft.-lbs. Where the 1G shows 15-19 ft.-lbs., the 2G shows precisely 17.
 
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