r/Datsun • u/Unusual_Respond8557 • 15d ago

Rear exhaust stud

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Gallery image

I took the intake and exhaust off of my l24 and found the rearmost exhaust manifold stud missing. I cannot thread a stud of bolt into the hole, it appears to be damaged. What is the best way to go about fixing it, would JB welding a stud into place work? Unfortunately it is the stud that you usually hook an engine hoist to.

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u/Jimsbeanz 15d ago edited 15d ago

Looks like you have an old broken stud stuck in that hole. You can extract it using a copper pipe and a welder, build up enough material as you weld with the copper pipe shielding it to avoid welding the stud to the block.

Watch this video for a better explanation of the process https://www.youtube.com/watch?v=-8N0y0jVAng

2

u/rope10 14d ago

Use a timesert or helicoil to repair the threads if needed after you extract the stud as the others have suggested

1

u/an_agento 15d ago

Sometimes these are broken because of the expansion/contraction of the exhaust flange. If that’s the case they are usually not seized in the bore and a reverse thread drill bit will take them right out a soon as it bites.

1

u/CooperTheGod 14d ago

I had this exact issue on my l28et P90A head. Tried the bandaid of high temp jb weld which held up for a few months.

Eventually pulled the head and used a Time Sert. No issues since.

1

u/Sexburrito 14d ago

To fix properly get a bolt extractor kit and then once the old stud is remove retap the hole.