10 replies to this topic

[leroy26]

any one recommend a decent exhaust sealant for where the down pipe meets the manifold?

[Boycie]

Can be difficult to keep this join sealed... but the sealant type is not really important.

The gearbox mount (that straps around the exhaust and bolts to the diff cover) must be present and correct. Use the stronger 2-bolt clamp for the manifold-downpipe join and after you've smeared a little sealant around the join, use a trolley jack to hold the join together while you skin your knuckles doing up the clamp.
Has always worked for me

[xtr hardcore]

If you get the clamp on correctly you shouldnt need to seal it because the downpipe has a nice little joint that should securly sit together with the Manifold. If so, i've got one that just exhuast seal, like putty then when dry's is like stone, very good holes that needs patching.

Edited by xtr hardcore, 09 April 2011 - 02:50 PM.

[Mini Adam]

I used Holts GunGum for this. Perfect stuff. Easy to use and works a treat

[donnadimples]

I used some assembly paste from motosave but it kept blowing the damn stuff out so in the end used the paste then wrapped a small piece of exhaust bandage round the joint clamped it up and its never leaked again: )

[DeanP]

Can be difficult to keep this join sealed... but the sealant type is not really important.

The gearbox mount (that straps around the exhaust and bolts to the diff cover) must be present and correct. Use the stronger 2-bolt clamp for the manifold-downpipe join and after you've smeared a little sealant around the join, use a trolley jack to hold the join together while you skin your knuckles doing up the clamp.
Has always worked for me

Thank you sir, I've been struggling for weeks to get mine to seal properly. I found your advice very helpful.

I will add though, it's important all your mountings are in good condition and you have the correct clamp for the manifold and exhaust. I ordered some online, went to a shop and despite telling them the year (it's a standard 1994 HIF carb set up) I got about three different clamps. The gearbox mount is very important because you need to maintain uniform movement between engine and exhaust the ensure the join doesn't open and close and rely entirely on the manifold clamp to hold it in place. I agree too that, a nice band of holts gun gum over the join helped keep mine blow free...

Edited by DeanP, 10 April 2011 - 03:31 PM.

[leroy26]

done all the above and still leaking!!
thinking bout putting some foil round it

[Boycie]

Foil won't last!
Are you sure the engine mountings/ steadies are sound? Grab the rocker cover and push and pull the engine back and forward. There should be almost no movement at the top at all.
If that's ok and you definately have the gearbox to downpipe clamp fitted and tight, it must be a badly fitting exhaust flange!

[leroy26]

it's a pig of a flange!! it's all bent up with at least a 5 mm gap round half where it meets the manifold.

[Boycie]

That may be the issue lol!

A new standard exhaust is very cheap nowadays, either that or (if you're not too worried about 100% originality) fit a stage 1 kit with a tubular manifold/ downpipe and decent exhaust system, problem gone forever!

[leroy26]

will try! cheers