Hi guys,

 

Located a whole load of boost leaks including one at each end of the balance bar. I've put new seals on it but it's still blowing, can't understand it. How does everyone else seal it up completely?

 

Also, I can't understand why it should be blowing past the nuts (lost one of the dome nuts), assuming the seals are sealing there should be no leakage here. Assuming they're not sealing I'd expect it to leak out of the sides rather than the more difficult route past the stud and nut (!?)

 

Perhaps the balance bar flanges are warped through previous overtightening?? I'm going to resort to some flange sealant for the time being I think.

 

Any reason why I shouldn't use some silicon hose between the balance bar and the clutch booster check valve?

 

Last thing, does anyone have a pair of throttle body intake hoses they'd care to sell? don't want to buy the whole set of 4 as I have dump valves on custom lower hardpipes.

 

Thanks in advance for any help.

 

H

Maybe the O-Rings are missing [where the balance bar meets the upper plenum]?!?!?!

Hi guys,

 

 

Any reason why I shouldn't use some silicon hose between the balance bar and the clutch booster check valve?

 

 

H

 

in theory you need proper vacuum hose. that hose contains a vacuum which on a standard silicon hose could colapse the hose (ie suck it shut) vacuum hoses are reinforced to stop this. then again it may work

I've installed new O-rings but still no joy. As it happens, closing off all the leaks I could get at has identified a big one on the intake manifolds (both sides) making the balance bar of little consequence :-( Not looking forward to tackling this, just had the plenum off and back on to fit a proper EGR bypass kit, now I've got to do it again goddammit !

 

Had the same thoughts about the clutch vacuum hose myself but wasn't sure if it was just another incidence of Nissan over engineering, might stick the old one back on to be safe, even though it's now half an inch shorter ;-). Don't think the vacuum could get to a level where the hose could collapse, thick walled narrowish bore...safety first though eh?

 

Cheers

 

H

Hi guys,

 

Located a whole load of boost leaks including one at each end of the balance bar. I've put new seals on it but it's still blowing, can't understand it. How does everyone else seal it up completely?

 

Also, I can't understand why it should be blowing past the nuts (lost one of the dome nuts), assuming the seals are sealing there should be no leakage here. Assuming they're not sealing I'd expect it to leak out of the sides rather than the more difficult route past the stud and nut (!?)

 

Perhaps the balance bar flanges are warped through previous overtightening?? I'm going to resort to some flange sealant for the time being I think.

 

Any reason why I shouldn't use some silicon hose between the balance bar and the clutch booster check valve?

 

Last thing, does anyone have a pair of throttle body intake hoses they'd care to sell? don't want to buy the whole set of 4 as I have dump valves on custom lower hardpipes.

 

Thanks in advance for any help.

 

H

 

 

Have you had your plenum polished - maybe the balance bar mounts have been 'ground' and are now uneven.

+1 for silicone sealant, just ensure both surfaces are clean beforehand. Allow the sealant to dry for five minutes on the plenum before fitting the balance bar.

 

Also, tighten each bolt up a bit at a time, ie, don't tighten bolt all the way up before starting on the other one...doing it gradually should help, much like on a head or cam cover.

No, plenum is far from polished, it's as Mr Nissan intended it - although possibly dirtier.

 

I used flange sealant to little effect, think it will be instant gasket as the last resort. I made sure I tightened the nuts and bolts evenly but still no good.

 

Cheers

H

Did you fix it matey?

No, got bigger problems than that at the mo, clutch booster appears to have sprung a leak, can hear it hissing at idle sometimes. I'll probably be in the market for a replacement shortly if anyone has a decent spare (?)

 

Cheers

H