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jeffro
New member
Username: jeffro
Post Number: 3
Registered: 05-2006
| | Posted on Saturday, October 27, 2007 - 09:49 pm: | 
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Hi all,
I am rebuilding a 1946 Crown M7 in a 1946 Garwood. In the service manual there are q's about rebuilding whether the engine is standard or reverse rotation. What is the best way to determine the rotation. Can you find it out by the serial number? I also need the firing order, and the cylinder numbers (I think the engine 'might' be numbered in reverse...thats just a guess tho.) |
jb_castagnos
Senior Member
Username: jb_castagnos
Post Number: 302
Registered: 07-2002
| | Posted on Sunday, October 28, 2007 - 09:41 am: |
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I'm not familiar with your engine but would guess it's an automotive type inline six. If so the numbers would start from opposite the flywheel end, usually the firing order is 153624. The distributor should have a cetrifugal advance, if so you can try to turn the rotor. If it springs forward and returns that's the direction of rotation, just turn the engine to see which way gives that direction. If that doesn't work you can watch the valves. Turn until you see one valve closing and another opening, the piston will be at top center. Proper rotation will be with the intake valve starting to open while rotating, if the exhaust opens you are turning backwards. |
drrot
Visitor
| | Posted on Friday, November 16, 2007 - 08:25 am: |
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Two quick ways to check:
1. Is the propeller Clockwise(RH) or Counterclockwise(LH)
2. There should be a hole in the flywheel center with tangs for a hand crank. Does it allow the flywheel to be turned Counterclockwise(RH) or clockwise(LH)
Firing order is 153624 if RH and 142635 if LH.
Does not watter which end you start from as it works out the same. Most engines had the rods and pistons numbered starting away from the crank as that is the way cars were done.
Most single engine applications were RH |
shawnstam
Member
Username: shawnstam
Post Number: 18
Registered: 10-2005
| | Posted on Sunday, December 02, 2007 - 11:40 pm: |
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I have a m47 and found out the one I was putting in my boat was reverse rotation so I ended up swaping camshafts and distibutor to make it turn in counter clockwise looking from the back of the engine foward. THis engine is was also run in fresh water all of its life. So I converted it to a fresh water cooled engine by mounting a heat exchanger and a circulation pump. |
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