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25hp cam shaft vs 36hp cam shaft
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vintage fiberglass
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PostPosted: Tue Oct 19, 2021 8:57 am    Post subject: Re: 25hp cam shaft vs 36hp cam shaft Reply with quote

So what are we saying now? a 36hp cam will not work well in a 25hp engine? I didn't want the fiber gear on the 25hp cam. I found a nice NOS LMB brand 36hp cam that is marked +1. I was going to use that? I also have an almost NOS set of 36hp rockers I was going to use??

Last question for now?? oil pump? I think I read that the 25hp pump had 17mm gears and others are using 26mm?? do they have 6mm studs or 8mm studs?
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splitjunkie
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PostPosted: Tue Oct 19, 2021 6:57 pm    Post subject: Re: 25hp cam shaft vs 36hp cam shaft Reply with quote

The cam is fine. That's was VW sold as a spare part for the 25hp once they ran out of the 25hp cams.

You can only use the +1 cam if the case requires it because it is out of spec to use the standard size.

36hp rockers are the same as is the oil pump.
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vintage fiberglass
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PostPosted: Tue Nov 30, 2021 9:54 am    Post subject: Re: 25hp cam shaft vs 36hp cam shaft Reply with quote

Does anyone know the size of the 25hp oil coolers bolts? are they 6mm or 8mm?
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bugnutt
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PostPosted: Tue Nov 30, 2021 9:00 pm    Post subject: Re: 25hp cam shaft vs 36hp cam shaft Reply with quote

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Interesting topic. The 52-57 workshop manual specifically addresses this issue and list all the parts they didn't consider interchangeable. The crankshaft, flywheel and gland nut are not the same for both engines. I found out this for myself when getting parts mixed up for a rebuild.
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bugnutt
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PostPosted: Tue Nov 30, 2021 9:09 pm    Post subject: Re: 25hp cam shaft vs 36hp cam shaft Reply with quote

Should have added, here are the parts the manual says are not interchangeable:

engine case
cylinder head
pistons and cylinders
intake valves
crankshaft pulley
fan belt
carb
intake manifold
distributor

no mention of camshaft so they must be the same
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