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Jun 09, 2018 11:42 am
Jun 09, 2018 11:42 am
Subject: Re: Exhaust Manifold Gasket
Hi John,
We had also planned a short "holiday" to follow, but the hotel charging an unexpected extra €66 for breakfasts (since refunded) and the overlooked cost of petrol to get home left us with no money to pay for it, whilst we still wait for money from our investments to be released, Don't invest with LMEP / AG2R!
Still find your nut loosening odd. Usual problem is totally the opposite, brass nuts appear to age-shrink onto their studs in this application. Not come across a Nord-Lock washer. Locking (or at least, spring) washers are unusual in this application, either because of corrosion or more likely, heat de-tempering the washer.
I think a far superior solution would be a suitable grade of Loctite. In fact, as that might prevent corrosion, could be a major benefit in that eventually undoing them in the future could actually be viable without stripping threads etc.
All this said, I think we are talking of addressing the symptom, not making the cure here. Firstly, I'd check that all your exhaust mountings are secure and effective. If that doesn't reveal anything untoward, perhaps there is some resonance/vibration within the engine causing this. I suspect the 2 Litre engine will be solidly mounted, so engine mounting unlikely to be a culprit, but worth checking mounting bolts. An unlikely contender could be cracked chassis or loose rivets, but I suspected you'd have encountered other problems in that case.
One final thought, could there be a problem with the thread form on the Club-supplied nuts you are using? Unlikely, as surely others would have encountered the same problem. Possibly the stud threads are worn; if rusted as they often are, de-rusting may have removed enough metal to cause problems, especially if what is left of the threads has effectively been polished smooth.
Laurence
Hi John,
We had also planned a short "holiday" to follow, but the hotel charging an unexpected extra €66 for breakfasts (since refunded) and the overlooked cost of petrol to get home left us with no money to pay for it, whilst we still wait for money from our investments to be released, Don't invest with LMEP / AG2R!
Still find your nut loosening odd. Usual problem is totally the opposite, brass nuts appear to age-shrink onto their studs in this application. Not come across a Nord-Lock washer. Locking (or at least, spring) washers are unusual in this application, either because of corrosion or more likely, heat de-tempering the washer.
I think a far superior solution would be a suitable grade of Loctite. In fact, as that might prevent corrosion, could be a major benefit in that eventually undoing them in the future could actually be viable without stripping threads etc.
All this said, I think we are talking of addressing the symptom, not making the cure here. Firstly, I'd check that all your exhaust mountings are secure and effective. If that doesn't reveal anything untoward, perhaps there is some resonance/vibration within the engine causing this. I suspect the 2 Litre engine will be solidly mounted, so engine mounting unlikely to be a culprit, but worth checking mounting bolts. An unlikely contender could be cracked chassis or loose rivets, but I suspected you'd have encountered other problems in that case.
One final thought, could there be a problem with the thread form on the Club-supplied nuts you are using? Unlikely, as surely others would have encountered the same problem. Possibly the stud threads are worn; if rusted as they often are, de-rusting may have removed enough metal to cause problems, especially if what is left of the threads has effectively been polished smooth.
Laurence