2.25 diesel exhaust manifold

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dag019

dag019

Well-Known Member
Posts
6,234
Location
Warwick
I need to replace the exhaust manifold on the 2.25 diesel in my '82 series III. I have the replacement and am currently soaking all of the nuts in penetrating fluid before attempting it.
Currently there look to be just standard nuts attaching the manifold to the head. Looking in the parts manual the correct part is a standard steel nut. On researching how to do this job a few people have said they use brass nuts to attach the manifold to the head in the same way brass nuts are used to attach the manifold to the down-pipe.
Is this something anyone here has done or can recommend? Do the brass nuts make any difference to the working of the engine as they cannot done up as tightly without stripping their threads?
 
Brass won't corrode to the stud but will take less torque than steel.
You can get copper plated nuts but presumably the plating fails eventually.
I use stainless which I read is a bad thing because they can't take the heat(?). Seems like bollocks to me and I've never had a problem.
 
I am just looking for something the future proof it if i need to take it off again in the future. but i am getting conflicting advice about what to use. I initial ordered the standard steel ones as I just looked in the parts book and ordered for the numbers. It was only when i started looking for tips that it was mentioned.
 
I use brass on the exhaust downpipe and steel on the manifold. Copperslip is your friend on a Land Rover or anything else you may need to dismantle. Use it on most fixings out of habit.
 
I already use copper slip on anything I take apart and put back so that will be a given when i reassemble. I had ordered the parts the same as you with brass for the down pipe and steel for the manifold as that sis what the parts book has. I think i will just stick to that.
 
I replace the manifold to day and everything came out and went back on perfectly until I came to refit the down pipe. The triangular clamp looks to be too large and the three holes do not line up with the three studs. Were there different manifold or exhaust pipe available?
The old manifold had had the studs drilled out (badly, one of the holes had cracked) which may have been to fit the larger clamp when the PO fitted it.
 
I have come across this once where a PO had drilled out the studs. I ended up using nuts and bolts to hold the downpipe on. Never blew or fell of though.
 
I got the replacement manifold from a member of another and rover forum, it is supposed to be from a series 3 diesel and looks to the same as the one I removed.
I am wondering if the reason the PO drilled the studs out was because the exhaust clamp the hole centers on the exhaust clamp are further out than the studs, and by forcing the bolts to fit and tightening down is the reason the old one eventually cracked the stud hole.
I will have a go at modifying the exhaust clamp to fit if not I'll order a new section of exhaust as they look to be very cheap.
 
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