sounds like a manifold leak but????

[lilkel]

i've got a friend with a VL that he's having problems with, he says it still drives ok, still has plently of power but it sounds like it has an exhaust manifold leak but he has check the exhaust and manifold and can't find anything suspect.... can anybody else offer any suggestions???? anything would be appreciated!!!

[bangers]

could be the flange gasket. you won't see anything suss but you'll hear it. same as manifold gasket. it might have come loose a little cos of snapped studs.

[Boganhunter]

What symptoms are causing him to think it's an exhaust manifold leak?

[lilkel]

What symptoms are causing him to think it's an exhaust manifold leak?

the noise it's making when i heard it the first thing i said to him was flange gasket but he reckons he's checked it and it's not that.... he also mentioned something about it sounding like it's backfiring when he backs off the accelerator???

[Tree cutter]

It has to be either the manifold gasket or flange gasket leaking to make it backfire when you back off the throttle. Take the heat shield off the manifold, start her up and give it a few quick revs on and off the throttle while someone listens with one ear close to the manifold. It should tick evertime you hit the throttle if it is leaking

[harry3]

backfiring can be from an intake manifold leak allowing air to be sucked in under vacuum
a length of garden hose with one end held to the ear can help isolate where the noise is coming from

[ivaninoz]

could be the flange gasket. you won't see anything suss but you'll hear it. same as manifold gasket. it might have come loose a little cos of snapped studs.

G'day Bangers, Ppl,

How long to change the Exhaust Gasket.
The one between the head and Ehxaust Manifold.
Any 'special' tools?
What else to do while I'm at it?

Would it be a "Flange Gasket"?
Um
What is a flange gasket?

It's sounding like a 'leak' only on one cylinder. It's on the Daughters RB30.

[jatsvl]

ivaninoz try pm ing bangers or post on his thread, but for wot its worth a couple of hours to change manifold gasket cos you'll probably break (if not already broken) at least two studs.remove the heat shield and check the rear manifold studs they're the ones that usually break. you'll need new studs!(12)stud extractor tool. flange gasket is where your cast iron manifold meets the twin engine pipe. use the garden hose in the ear technique as previously mentioned on this thread to locate the leak. recommend extractors! no more broken studs engine runs cooler, eliminates flange and gasket

[ivaninoz]

use the garden hose in the ear technique as previously mentioned on this thread to locate the leak. recommend extractors! no more broken studs engine runs cooler, eliminates flange and gasket

Garden Hose, YEP, from my [Still present] Bike days.
Much better than Flamible Degreaser

Extractors; 2nd OK?
Else, where from. It's only for Commuting, or Highway driving 80Klm into Uni
Thinking Standard would Sufice, yes/no

[jatsvl]

2nds OK! try many wreckers not sure on availability standard fixed properly now will sufice for years to come make sure you are able to extract broken studs before starting, I didn't and had to call a young fella named CAPTAIN THREAD (sth oZ) mobile service cost me $50 two broken studs he knows his stuff good bloke!