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Post by 3litrekiwi on Jan 5, 2024 9:33:45 GMT
From the parts book and the posts here, plus the machined boss not being relevant if it doesn't bear on anything, the circular boss should face away from the engine block and the machined face provides a flat surface for the lock washer and nut to seat on.
Cheers
Martin
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Post by Phil Nottingham on Jan 5, 2024 9:42:20 GMT
I'm a bit confused about the clamps of the manifold. All the pictures I find on Google show the curved side in sight, flat side at the manifold. I read here they should sit the other way around? Can anyone post a picture of that? The pics are wrong! It is essential the curved side faces the block. The "Flat" side has the washer lands for the nuts. This allows the manifold to slide when it heats up otherwise it will distort and blow the gasket and in the end crack it. The nuts must on;u be tightened 1/2 a turn. To me this is the logical assembly
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break23m
Rover Rookie
Getting a 3 Litre Mk II automatic back on the road
Posts: 49
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Post by break23m on Jan 5, 2024 9:59:38 GMT
Thanks, 3litrekiwi, that is a good tip: the parts catalog has a picture that I can understand. The nut must be on the 'washer land'. And now I do understand the message, Phil Nottingham. Thank you for repeating it. The rounded edges of the 'flat' side made me wonder what is what, didn't recognize the curve. Okay, on my car the clamps are placed as the should be. Still have to find the gas leak. Not on the flange to the down pipe. Probably not on the manifold, even if I did find one nut that someone forgot to tighten.
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Post by Phil Nottingham on Jan 5, 2024 11:33:20 GMT
Overtightening the nuts and fitting the clamps the wrong way round distorts the manifold and can cause a minor clacking leak that sounds just like a loose tappet. It can stay like that for sometime until the gasket burns. This leak can result in fumes being drawn into the car
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