Engine rotation confusion

Engines, Shafts, Steering, Struts, Rudders, etc.
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shelbygt
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Engine rotation confusion

Post by shelbygt »

I'm a little confused about engine rotation. I have a single engine. As I view the engine from the front, rotation is CCW. As I view it from the rear, rotation is CW. There seems to be differing opinions on whether rotation is determined from the front or rear of the engine. The reason I'm asking is because I want to make sure my new alternator is cooling properly so need to know rotation so I can get thr right fan for the front it.
1962 Marinette 31' Express
Single Gray Marine AMC 327

1955 Feathercraft Deluxe Runabout
Mercury 500

1976 Saquaro Jet Boat
Ford 460
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GB49
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Location: Catawba Island, OH.

Re: Engine rotation confusion

Post by GB49 »

Check this thread on rotation.

https://marinetteboat.com/forum/viewtopic.php?f=6&t=180

Most important is understanding where the front and rear of engine are located.
1986 Sedan 32'. Twin Chrysler 360in^3, 275hp.
Forum member since 1998.
shelbygt
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Re: Engine rotation confusion

Post by shelbygt »

Wow. Is that post ever confusing. Is the moral of the story that rotation is determined by standing at the stern (aft) and observing rotation?
1962 Marinette 31' Express
Single Gray Marine AMC 327

1955 Feathercraft Deluxe Runabout
Mercury 500

1976 Saquaro Jet Boat
Ford 460
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bill
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Location: Grosse Ile MI

Re: Engine rotation confusion

Post by bill »

:|
I believe on the alternators it make NO difference on rotation as far as charging goes! Now Cooling is a different matter :!:

On a differant note :roll:
My 37' with twin 360. The port engine is left hand rotation, the prop turns inboard :!:
bill

How do I determine the correct Starter Rotation? :ugeek:

http://bpi.ebasicpower.com/faq/starterrotate.htm :D
Last edited by bill on Sun Oct 05, 2014 12:57 pm, edited 1 time in total.
Former owner of
ALUMINATION
Grosse Ile MI
Located on LakeErie
37' F/B Sedan
1975
Twin 360 Chrysler Marine
Raw water cooled
Hydraulic steering both helms
USCG Master Lic. Retired[/color]
Third Owner bill
shelbygt
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Re: Engine rotation confusion

Post by shelbygt »

Does make difference on alternator because there's a fan on the front (behind the pulley) that draws in air to cool the alternator.
1962 Marinette 31' Express
Single Gray Marine AMC 327

1955 Feathercraft Deluxe Runabout
Mercury 500

1976 Saquaro Jet Boat
Ford 460
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