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Engine sounds like there's a hole in the exhaust but there isn't
Posted: Fri Oct 06, 2017 11:58 am
by culp
My 1970 Traveller has a very raspy exhaust note coming from under the bonnet like there's a hole in the exhaust. I've been right over the exhaust pipe and there's nothing wrong with it, no holes. I'm thinking it's an ignition timing problem?
Re: Engine sounds like there's a hole in the exhaust but there isn't
Posted: Fri Oct 06, 2017 12:20 pm
by oliver90owner
My first thought would be to inspect the exhaust system in front of the exhaust pipe - like manifold and joints.
Re: Engine sounds like there's a hole in the exhaust but there isn't
Posted: Fri Oct 06, 2017 12:42 pm
by simmitc
I can't see an ignition problem making a rasping sound. I would concentrate on the carb area. The air filter should have an inlet tube that acts as a silencer. If this has fallen off then it can sound like an exhaust noise. When cold, try wiggling the exhaust pipe to see if it is loose - it should be rock solid. Also look for tell tale streaks of soot/carbon. With engine running, and taking great care to avoid moving and hot parts, listen/feel for a blow in the general area around the manifold.
Re: Engine sounds like there's a hole in the exhaust but there isn't
Posted: Fri Oct 06, 2017 1:09 pm
by dalebrignall
check the mainfold clamp is there a leak between the manifold and the down pipe it might need some gun gum round the joint
Re: Engine sounds like there's a hole in the exhaust but there isn't
Posted: Fri Oct 06, 2017 2:01 pm
by culp
It's pretty hot around there, but there is no sign of a leak around the manifold or the exhaust/manifold join.