Construction and other equipment - d12 exhaust manifold mounting bolts

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d12 exhaust manifold mounting bolts

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=119339
Printed Date: 24 Jun 2025 at 12:59pm
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Topic: d12 exhaust manifold mounting bolts

Posted By: Travo
Subject: d12 exhaust manifold mounting bolts
Date Posted: 22 Feb 2016 at 11:10am

Are the two inside bolts for the exhaust manifold, on a D12 wet bolts? If so, is there any suggested method of sealing the threads?

I recently had the head rebuilt. After putting everything back together and putting coolant in, I noticed that there is coolant leaking from the bolt holes (while bolt is in hole). If I take a bolt out, fluid gushes out. I assume that they pass through the jacket.. Can anyone confirm this.

Thanks,
Travis

Replies:

Posted By: Tracy Martin TN
Date Posted: 22 Feb 2016 at 11:13am

That is common with them. Use a good non hardening sealer like Permatex brand. Tighten the stud down before installing manifold, you won't have any proiblems. HTH Tracy

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Posted By: CTuckerNWIL
Date Posted: 22 Feb 2016 at 12:01pm

There shouldn't be any "bolts" there. Use a stud and do like Tracy said, bottom the studs out in the threads but don't torque them in place, just snug them in the bottom and then torque the nut.

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