20 replies to this topic

[yeti21586]

its a 1100 engine with a 12g206 head oselli inlet manifold and a 3 - 1 exhaust manifold and i fitted a new gasket because i was fiting the new 3-1 exhaust manifold and tis now blowing how do i stop it????


help the MOT is soon


YetI

Edited by yeti21586, 17 April 2009 - 09:48 PM.

[MRA]

Which manifold gasket did you fit ?

Is it a 3 in to 1 that joins just under the car ?? If it is you should have fitted a large bore manifold gasket

[yeti21586]

ok that will be were i went wrong

[chappy]

sorry to hijack...

but i fitted an SPI gasket to my maniflow freeflow manifold, because i was told that it would be less likely to blow than the standard one (due to the metal side on it)

but would this now be causing me problems?



oh my engine is a 998cc carb model

sam

[twiggy]

I did the same, fitted a new gasket then the exhaust. When I fitted the exhaust it knocked the manifold and gasket and caused a blow! Undo the manifolds again, reseal the gasket and whack em back on and HOPE

[mini_mad69]

Are you doing the nuts up tight enough, I know there very hard to get too on some minis,

[chappy]

as tight as i can..


should i be using a gasket sealant on the new gasket? i thought it was just a case of putting it on and tightening up

[MRA]

you should not put gasket sealant on an exhaust gasket, because it will leak, due in part to irregularities within the spread layer of sealant, the type of fuel used etc........

[BLUE ITALIAN JOB]

when fitting any type of lcb exhaust manifold make sure the mounting flanges are the same thickness , the parts that go to the head that compress the gasket very often you may find the exhaust flanges are thinner and do not compress the gasket properly and ends up leaking / blowing , either use a stepped washer or machine the flanges to the same thickness as the inlet flange , check how the thick washer sits on the manifolds - should be flat across both inlet and exhaust manifolds and adjust to suit ,

[yeti21586]

i had to buy new nuts because i stipped them the first time (the first ones were brass the new was are stainless) and yes ive done them as tight as i can

[MRA]

Th eold original ones where brass........ this was for thermal and corrosion reasons...... no one seems to bother with them anymore and Rover swapped over to steel anyway.

Edited by mra-minis.co.uk, 19 April 2009 - 08:15 PM.

[Nightrain]

Rover swapped over to steel anyway.

Only because it was cheaper ! If you've got brass nuts use 'em.

[yeti21586]

Rover swapped over to steel anyway.

Only because it was cheaper ! If you've got brass nuts use 'em.

i did have the brass ones but i stripped them and a friends gave me stainless ones which are good but its blowing still with it done up tight as i can so should i get a big bore gasket???

[Nightrain]

Are the flanges the same thickness on the inlet and exhaust manifolds ? It was mentioned above, if there not you will never get both manifolds clamped up correctly. You need to file/grind half the washer to allow for the differences in thickness of the manifolds.

[yeti21586]

wots a flange/??