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Re: Thoughts about intake manifold leaks, comments (archive)
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Posted by Odd-Jarle Kristoffersen / 91 750iL on April 29, 2001 at 18:18:05:

In Reply to: Thoughts about intake manifold leaks, comments? posted by Henkka 750i on April 29, 2001 at 18:05:46:

Well, we´re partly thinking the same things. I´ve been wanting to replace mine either way sometime soon (192000km). And I noticed Dinan USA mentioned that the original gasket _is_ a problem on the 750 as they are not well enough designed and can leak. So they´ve made some better ones ($229 I believe though). It wouldn´t hurt to change them I would think.

I suspect mine could be growing old now too. It´s been idling a bit rough sometimes, not much though. Could be plugs too I guess... Not sure if they get changed at Inspection II... (which was had at 187000km)

I haven´t heard a peep from Zygmunt either. I ordered my Bentley about 1 month ago now. I even emailed to check if they got the order. But no word back yet...


I used to have a mint 1988 316 1.8 that I really loved. It had 125,000 km (77,000miles) when I bought it and it suffered from crazy idle ranging between 500 and 1500 rpm.

What the dealer did NOT know and what I myself found out from quite another source was that this car was supposed to have the thick rubber seal under the carburettor (yep last year and last model of carburetted Bimmers) changed at every 80,000km. This had naturally not been done, the stealer had no idea such part existed and many 316 1.8 Bimmers I've seen have had the same problem, including the one POS my wife drives now.

WHAT IF the M70 engine (750i 5-litre V12) has a similar issue? What if you're SUPPOSED to change the intake manifold rubbel seals (is there one?) or gaskets every 80,000 or 100,000 or 150,000 km? (50,000 or 100,000 miles about) What if this information ALSO has not been told to the dealers - or they have but no one remembers it and none of us have taken our cars there for years - and thus the cars have not been serviced right concerning this issue?

What if you're supposed to tighten them every X km or something? I know the engine was designed to be very quiet so a lot of anti-vibration and anti-noise materials/design was used, such as the plastic cover thingy on top of the intake manifolds, could it be there are "too" soft seals/gaskets to prevent vibration and you're therefore supposed to tighten/replace them every now and then?

Those of you lucky enough to have already received their Bentleys (what the heck is wrong with those guys at zigmunt's???); is there a list of periodical services? are the intakes metioned anywhere?

Henkka
leaking like someone shot holes in the intake manifolds :-)




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