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Old 07-01-2015, 01:41 PM
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Camshaft Question?

I've attached a picture of a camshaft drive gear out of the short block I'm replacing in my boat.
The orientation is so that the top of the picture is the front of the engine, and you're looking down the distributor hole.
The oil pump drive shaft hole is on the left.

Can anyone tell me if this camshaft is LH or RH rotation?
I bought a new short block and the supplier tells me it has a LH rotation camshaft but it's cut opposite of my this engine (in this picture), and it doesn't mesh with my distributor drive gear.

This has me really scratching my head...

Thanks
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Last edited by tockit; 07-01-2015 at 02:18 PM.
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Old 07-01-2015, 03:08 PM
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is this looking from the bottom?

post a pic of the "new" engine
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Last edited by j.mccreight@hotmail.com; 07-01-2015 at 03:19 PM.
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Old 07-01-2015, 03:14 PM
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here is a top view through distributor hole front of motor is down in this pic, standard rotation (LH) cam gear is left of oil pump drive and you can see the teeth are right to left.
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Old 07-01-2015, 04:02 PM
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Quote:
Originally Posted by j.mccreight@hotmail.com View Post
here is a top view through distributor hole front of motor is down in this pic, standard rotation (LH) cam gear is left of oil pump drive and you can see the teeth are right to left.
If the bottom of your picture is the front of the engine, then the cam drive gear is cut the same as the one in my picture. My picture is rotated 180 degrees from yours. Is that the way you see it?
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Old 07-01-2015, 04:07 PM
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Quote:
Originally Posted by j.mccreight@hotmail.com View Post
Standard rotation (LH) cam gear is left of oil pump drive and you can see the teeth are right to left.
You're kind of confusing me with this statement. Is my camshaft standard rotation or reverse rotation (LH)?
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Old 07-01-2015, 04:07 PM
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Quote:
Originally Posted by tockit View Post
If the bottom of your picture is the front of the engine, then the cam drive gear is cut the same as the one in my picture. My picture is rotated 180 degrees from yours. Is that the way you see it?
yes...both your pic and my pic are of a standard rotation (LH) camshaft.
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Old 07-01-2015, 04:12 PM
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Quote:
Originally Posted by j.mccreight@hotmail.com View Post
yes...both your pic and my pic are of a standard rotation (LH) camshaft.
(LH) isn't reverse rotation?
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Old 07-01-2015, 04:34 PM
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Quote:
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(LH) isn't reverse rotation?
no, sorry...hopefully the shop will make it right...
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Old 07-07-2015, 07:31 AM
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LH vs RH conventions may be different in the auto and marine world as they relate to standard vs reverse rotation. That is likely the source of confusion. In the marine world, RH = reverse rotation. Rotation is referenced from the rear.
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