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vintage fiberglass Samba Member
Joined: January 23, 2006 Posts: 485 Location: Reading, Pa
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Posted: Tue Oct 19, 2021 8:57 am Post subject: Re: 25hp cam shaft vs 36hp cam shaft |
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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 Samba Member
Joined: April 04, 2006 Posts: 4091
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Posted: Tue Oct 19, 2021 6:57 pm Post subject: Re: 25hp cam shaft vs 36hp cam shaft |
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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. _________________ Chris
You know, a lot of these scratches will buff right out... Jerry Seinfeld |
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vintage fiberglass Samba Member
Joined: January 23, 2006 Posts: 485 Location: Reading, Pa
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Posted: Tue Nov 30, 2021 9:54 am Post subject: Re: 25hp cam shaft vs 36hp cam shaft |
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Does anyone know the size of the 25hp oil coolers bolts? are they 6mm or 8mm? |
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bugnutt Samba Member
Joined: July 03, 2005 Posts: 16
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Posted: Tue Nov 30, 2021 9:00 pm Post subject: Re: 25hp cam shaft vs 36hp cam shaft |
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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 Samba Member
Joined: July 03, 2005 Posts: 16
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Posted: Tue Nov 30, 2021 9:09 pm Post subject: Re: 25hp cam shaft vs 36hp cam shaft |
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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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