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+--- Thread: Coolant leak from manifold studs (/showthread.php?tid=9577)
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Coolant leak from manifold studs - iandecjak - 09-09-2024
After engine rebuild refit etc the Ruby MK 2 is now starting and idling quite well. Problem we seem to have now is coolant leaking from a number of manifold stud brass nuts. The manifold itself does not seem to be leaking any exhaust gases or fuel.
Are there any well used fixes?
We were thinking of undoing one nut at a time and getting some blue hylomar in there before refitting washer and nut or is it best to tackle this at the cylinder head end and remove the manifold completely?
RE: Coolant leak from manifold studs - Reckless Rat - 09-09-2024
The leaks come from the threads of the manifold studs where they're screwed into the engine block as some of the drillings penetrate into the coolant gallery. The best, and usually permanent fix is to take the manifold off and then remove the offending stud and refit using some loctite. That is somewhat simplistic because often you will either shear off a stud or damage it trying to extract it. Better to be forearmed with some new replacements before tacking the job.
RE: Coolant leak from manifold studs - Howard Wright - 09-09-2024
Hi
Not the best practice, but I’ve just removed the nuts, smeared Threebond on the threads and washer, tightened back up. These kind of leaks tend to heal after a while (there is always the exception to the rule!)
Howard
RE: Coolant leak from manifold studs - andrew34ruby - 09-09-2024
I took nuts off one-at-a-time and wrapped PTFE tape around, then put nuts back on. (better not mention the k-seal as not everyone is happy with it).
RE: Coolant leak from manifold studs - Terrytuned - 09-09-2024
Seal the studs in the block if water gets drawn into the inlet ports it will damage the pistons. Terry.
RE: Coolant leak from manifold studs - Nick Salmon - 09-09-2024
Some years ago I photographed and annotated, the process of curing leaks from the manifold studs. I've put it in the form of a video in case it is of use to anyone in future.
https://www.flickr.com/gp/134441372@N05/8Fpmt63c85
RE: Coolant leak from manifold studs - Steve Jones - 09-09-2024
I always fit manifold and block studs with a turn or two of PTFE tape as a matter of course. Just make sure you wind it on such that it doesn't unwind when you fit the studs
Steve
RE: Coolant leak from manifold studs - "Slack Alice" Simon - 09-09-2024
Radweld, in the short term?
RE: Coolant leak from manifold studs - David Stepney - 09-09-2024
Every time I have had my engine seriously to bits, I have always ended up with a small coolant leak. A bottle of K-seal works wonders!
RE: Coolant leak from manifold studs - Charles P - 09-09-2024
Live in a hard water area.
A fill with of tap water tends to seal minor weeps, but I do put them in with loctite to be safe.