Coolant in 67 oil. - Pontiac GTO Forum

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post #1 of 5 (permalink) Old 01-12-2013, 01:07 PM Thread Starter
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Coolant in 67 oil.

Just had original 400 HO engine rebuilt. Found water in the oil before startup. The mechanic thinks it should be coming from timing chain cover as there was some corrosion there. Also the machine work was done by a very reputable machine shop that just does engines so he thinks a leak in the head is unlikely. We tried to check the timing cover for a leak but were unable to find one but can't put pressure on it with it off. I would just get another cover but having difficulty finding one for 67 it seems only area king repro for 69 and up. First question is it likely the timing cover or head and could it be coming from somewhere else? Second is a 67 and 69 cover interchangeable and if not where can I find a 67. It's leaking a lot. Filled up a 12 oz glass over night with anti freeze when pressurized. Thanks
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post #2 of 5 (permalink) Old 01-12-2013, 03:12 PM
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Did you apply sealant to the front cover bolts that go into the block? That's a good place for coolant to get into the crankcase.

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post #3 of 5 (permalink) Old 01-13-2013, 07:46 PM
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You can find good used early covers. If you go to a late style, you will have to change all of your pulleys, as the belt alignment will be off. Big hassle. If the cover is pitted or corroded severely, it needs replacing anyway. Replace the cover and re-check the system. If it ain't the cover,it could be head gaskets, cracked head, or a cracked block. Do the obvious first....replace/repair the cover.
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post #4 of 5 (permalink) Old 01-14-2013, 08:04 AM Thread Starter
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Thanks for the responses guys. I was able to find a 67 cover from d&j gto parts. That guy has everything. I went in to get that 100 dollar cover but came out 600 dollars later with a lot of trim and little detail stuff I'd been looking for. This is my first GTO restoration and I'm starting to see that pattern develop. We did seal the bolts but the cover was pretty ruff so hopefully this will fix it. Thanks again guys ill let you know how it goes. Going to try to get it all back together this week.
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post #5 of 5 (permalink) Old 01-16-2013, 11:03 AM
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I've seen guys clean the pitted areas then fill with JB Weld and sand flat after drying with good results.
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, LeMans & GTO Technical and Electrical Wiring

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