1 Inlet Manifold Leak Mon Apr 19 2021, 19:04
jjefferies
Life time member
Hi all,
Started an oil change the other day. For some reason my restored K75 seems to be burning oil at a somewhat faster rate than expected. This would have been my first oil change since getting it back together. So I'm letting it warm up and for unremembered reason I was running my hand outside the fuel rail when I felt a pulsating air. So I shoot WD-40 at the throttle bodies and find that it is sucked in on cylinder #1. So after a great deal of feeling around and noting that the engine runs smoother when sucking in the WD-40, I conclude that my #1 cylinder has an air leak at the Inlet Manifold base.
Inlet Manifold - BMW K75, K100; 11 61 1 460 408 / BMW
Much like the thread on "clean and replace" https://www.k100-forum.com/t14821-clean-and-replace-throttle-bodies-and-plenum
I pull the plenum, and the throttle bodies out of the "Inlet Manifold(s)". The Inlet manifold piece appears to be unbroken/damaged and it was torqued down reasonably (I thought). So I cleaned the whole area using carburetor cleaner. There is some grunge on the metal body which necessitates scraping and multiple cleanings. The Manifold Inlet itself has two grooves in the base which may have served as part of the seal but they are clean. Now comes my question, I've been advised to put some sealant on the bottom before replacing the Manifold Inlet. Quick trip to the local auto parts store leaves me rather confused. There are numerous choices of products which seem to fall into two categories, gasket makers and gasket sealers. There are at least 3 manufactures and their products differ by temperature range, resistance to oil, water, anti-freeze and color (this latter is apparently a major selling point. So I'm soliciting suggestions as to what product to use. I'd prefer not to purchase on Amazon as that would slow down reassembly as well as I don't like Amazon. Oh and my location is the USA. I'm leaning toward the temperature range of up to 650F/243.C. But wondered if the difference between a gasket maker and a gasket sealer would be critical?
Started an oil change the other day. For some reason my restored K75 seems to be burning oil at a somewhat faster rate than expected. This would have been my first oil change since getting it back together. So I'm letting it warm up and for unremembered reason I was running my hand outside the fuel rail when I felt a pulsating air. So I shoot WD-40 at the throttle bodies and find that it is sucked in on cylinder #1. So after a great deal of feeling around and noting that the engine runs smoother when sucking in the WD-40, I conclude that my #1 cylinder has an air leak at the Inlet Manifold base.
Inlet Manifold - BMW K75, K100; 11 61 1 460 408 / BMW
Much like the thread on "clean and replace" https://www.k100-forum.com/t14821-clean-and-replace-throttle-bodies-and-plenum
I pull the plenum, and the throttle bodies out of the "Inlet Manifold(s)". The Inlet manifold piece appears to be unbroken/damaged and it was torqued down reasonably (I thought). So I cleaned the whole area using carburetor cleaner. There is some grunge on the metal body which necessitates scraping and multiple cleanings. The Manifold Inlet itself has two grooves in the base which may have served as part of the seal but they are clean. Now comes my question, I've been advised to put some sealant on the bottom before replacing the Manifold Inlet. Quick trip to the local auto parts store leaves me rather confused. There are numerous choices of products which seem to fall into two categories, gasket makers and gasket sealers. There are at least 3 manufactures and their products differ by temperature range, resistance to oil, water, anti-freeze and color (this latter is apparently a major selling point. So I'm soliciting suggestions as to what product to use. I'd prefer not to purchase on Amazon as that would slow down reassembly as well as I don't like Amazon. Oh and my location is the USA. I'm leaning toward the temperature range of up to 650F/243.C. But wondered if the difference between a gasket maker and a gasket sealer would be critical?