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 Rough running when cold
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72RPR

Australia
26 Posts

Posted - 06 Aug 2019 :  12:13:37  Show Profile  Reply with Quote
Hello again, My FB has had rough running when cold, disappearing when the motor warms up. Traced it to loose manifold nuts/studs.. Tightened them up, rough running ceased. Anyone else experienced this problem. Has been occurring over a few months. Told it is due to the expansion and contraction of the alloy head and manifolds. Another frequent inspection to be carried out.

jimlagos

United Kingdom
182 Posts

Posted - 06 Aug 2019 :  12:32:23  Show Profile  Reply with Quote
I've often wondered about the diferent expansion of Aluminium and steel/iron and the chances of trouble on my series V Rapier. Never had the problem (yet) but a good tip to put the spanner on the nuts occasionally.

jim
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72RPR

Australia
26 Posts

Posted - 26 Aug 2019 :  01:13:41  Show Profile  Reply with Quote
Hello jimlagos, it appears talking to Aus friends that the slant engine in the Rapier has been the cause of manifolds coming loose. I was asked to check and see if I had a bracket fitted between the bell-housing and the exhaust pipe! It was said that when the motor rocked this caused the unmounted exhaust to work the manifold loose. By anchoring it to the bell-housing, the whole exhaust unit moved thereby preventing the working loose of the manifolds!
Does anyone know of the bracket part and where could I get one?
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72RPR

Australia
26 Posts

Posted - 05 Sep 2019 :  07:39:20  Show Profile  Reply with Quote
Hi guys, Had my Strombergs tuned by an expert and the car runs beautifully now. Loose manifold nuts - they are all OK now, what the problem turned out to be was a loose diaphragm on the brake booster. I had recently put on a new one and apparently my screw-tightening wasn't up to scratch!!
Another item to check on the regular maintenance.
Pays to check these things for troublesome free motoring.
Had a flat battery on my '58 Rapier series 2. New battery purchased and then I discover the brake switch has decided to remain ON. Oh well, off to the spares dept tomorrow. It's only money after all.
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