stuck Posted January 4, 2012 Share Posted January 4, 2012 Gent's, Should the plenum on a V8 be sealed with Hylomar or are the two alloy surfaces sufficently smooth? If it should have sealant but doesn't would I be right in assuming that this could cause an erratic idle speed? Ta, Mick. Quote Link to comment Share on other sites More sharing options...
zim Posted January 4, 2012 Share Posted January 4, 2012 I've done it with and without before. My offroader is sealed to stop water getting in. G Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted January 4, 2012 Share Posted January 4, 2012 There is a special LR "Glue Stuff" for this, a locktite special product in a red concertia type container NOT using sealer will allow air in and cuase all sorts of problems. Nige Quote Link to comment Share on other sites More sharing options...
Tom1809 Posted January 5, 2012 Share Posted January 5, 2012 Can't you just use rtv sealant then ? As that's what I've stuck mine together with . Tom Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted January 5, 2012 Share Posted January 5, 2012 Silicone based RTV will kill the lambda dead The LR stuff is semi setting too Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted January 5, 2012 Share Posted January 5, 2012 Blue hylomar works great here.... Quote Link to comment Share on other sites More sharing options...
Tom1809 Posted January 5, 2012 Share Posted January 5, 2012 Ah carp, better take it apart again and get the lr stuff then. Saved me a few problems down the line then. Tom Quote Link to comment Share on other sites More sharing options...
stuck Posted January 6, 2012 Author Share Posted January 6, 2012 Gent's, Just taken the plenum off my 4.6 to reseal it & have found that the "trumpet" for No.7 has come out completely and the one for No.5 is very loose! Couple of questions if you don't mind: Would this cause the engine to run roughly? How should they be held in? Cheers, Mick. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted January 6, 2012 Share Posted January 6, 2012 IIRC they are held in with something similar to blue hylomar, as far as running goes, it could cause rough running, but I doubt it would affect things too greatly, unless the loose trumpet was blocking the port....? Quote Link to comment Share on other sites More sharing options...
stuck Posted January 6, 2012 Author Share Posted January 6, 2012 Cheers Bowie, I'll "glue" them back in in the morning. I've found why it's running rough, nothing to do with the plenum after all.. If you get chance would appreciate you having a look at the MS section, could use some advice. Thanks, Mick. Quote Link to comment Share on other sites More sharing options...
thingybox Posted January 7, 2012 Share Posted January 7, 2012 What does the plenum do? Could you use the plenum for a 3.9 on a 4.2, or a 4.4, or a 4.6 and vice versa? Are they interchangeable? Quote Link to comment Share on other sites More sharing options...
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