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Redbarnresto
Samba Member
Joined: May 29, 2007
Posts: 203
Location: Girard, OH
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 Posted: Thu Dec 11, 2025 7:05 am Post subject: Late Bay Front Transmission Mount Variation |
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Hi, all. I ordered a new front transmission mount for this ‘73 and what arrived (mounted) is a little different than what came off (what I’m holding). I was going to figure they’re “the same thing but different” but decided I really ought to find out for certain before putting everything together. First off, are they perfectly interchangeable? Second, does the new style not use the big, round, rubber bumpers? They don’t slide nearly as far onto the forks, so I’m guessing not. Again, just want to be sure.
Thanks!
Dan
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timvw7476
Samba Member
Joined: June 03, 2013
Posts: 2523
Location: seattle
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| Posted: Thu Dec 11, 2025 4:41 pm Post subject: Re: Late Bay Front Transmission Mount Variation |
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Never seen a bus mount with those rubber bushings on it.
I'm going to make a mistake & assume it is a later Mexican mount of some sort.
The seventies mounts I've seen & put on are steel on steel block/clamped with 17mm bolts. ????
Only thick rubber is trapped in the sleeve/clamp to the nosecone. |
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Redbarnresto
Samba Member
Joined: May 29, 2007
Posts: 203
Location: Girard, OH
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| Posted: Thu Dec 11, 2025 5:16 pm Post subject: Re: Late Bay Front Transmission Mount Variation |
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It’s what they show in the Bentley. Not entirely sure what the function of the rubber rings is if I’m honest. They must help in limiting movement a little.
Dan
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airschooled
Air-Schooled
Joined: April 04, 2012
Posts: 13628
Location: West Coast, USA
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| Posted: Thu Dec 11, 2025 6:12 pm Post subject: Re: Late Bay Front Transmission Mount Variation |
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At the factory, the rubber bumpers align the transmission and engine hanger mounts in the rear. They’re a solid alignment stop without being metal and introducing more vibrations.
They’re not needed as long as you don’t mind aligning the drivetrain by eye with screwdrivers and swear words.
Robbie
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germansupplyscott
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Joined: May 22, 2004
Posts: 7286
Location: toronto
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| Posted: Thu Dec 11, 2025 8:53 pm Post subject: Re: Late Bay Front Transmission Mount Variation |
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| airschooled wrote: |
At the factory, the rubber bumpers align the transmission and engine hanger mounts in the rear. They’re a solid alignment stop without being metal and introducing more vibrations.
They’re not needed as long as you don’t mind aligning the drivetrain by eye with screwdrivers and swear words.
Robbie |
I've worked on many many Buses with these donuts on the mount (I think they are only on '72 & '73) and never understood the exact purpose of the donuts on the early mounts. The above makes sense. Whatever the purpose was, it was deemed expendable because the donuts disappeared after (?) '73.
The way I align the mounts is to have the mount hardware on this mount, and the 4 sets of screws/nuts/washers on the rear carrier bar, snug but not torqued. Able to move just a little. The hardware on the upper carrier, the two large screws that fasten to the ears on the transaxle, are fully torqued.
Run the engine (not drive it, just run it) and allow the engine/trans assembly to settle/centre itself naturally. Then torque all the remaining fasteners. This has never failed to get a good centred alignment.
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airschooled
Air-Schooled
Joined: April 04, 2012
Posts: 13628
Location: West Coast, USA
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| Posted: Thu Dec 11, 2025 9:15 pm Post subject: Re: Late Bay Front Transmission Mount Variation |
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Did they disappear that early? I thought I’ve seen them on most pre-091 buses.
Bentley gives good instructions on settling the drivetrain, I mostly struggle with getting the transmission ears aligned with the engine rear and nose cone mounts lined up. Usually 2 of the 3 mount locations line up easy for me, and I fight one or another…
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SGKent 
Samba Member
Joined: October 30, 2007
Posts: 42955
Location: at the beach in Northern Wokistan
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| Posted: Thu Dec 11, 2025 11:18 pm Post subject: Re: Late Bay Front Transmission Mount Variation |
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those donuts do not work with the late 091 mounts.
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