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reverse rotation engines

Posted: Mon Mar 26, 2018 12:04 am
by Harryb
Hi all, does a reverse rotation motor use a different distribtor drive gear or can I use any 318 distribtor and oil pump drive gear from napa or some other auto parts supplier for my reverse engine. Thanks

Re: reverse rotation engines

Posted: Mon Mar 26, 2018 6:11 am
by Fastjeff
The gears driving the oil pump/ distributor are made to turn them backwards. The RR distributor has a collar around it to absorb the trust loads from the gears since it rotates in the opposite direction. So....you need the RR distributor but not the oil pump (that is the same).

Jeff

Re: reverse rotation engines

Posted: Mon Mar 26, 2018 8:12 am
by Harryb
Thanks Jeff, I have everything for the reverse running engine except the the drive gear that runs the distributor and oil pump can I use the drive gear I got from napa or does it have to be a special one just reverse running motors. I have new long block just not the distributor drive gear.

Re: reverse rotation engines

Posted: Mon Mar 26, 2018 10:39 am
by EWRice
Let me know if you need the parts. I should have a few sets.

Re: reverse rotation engines

Posted: Mon Mar 26, 2018 8:05 pm
by Harryb
Thanks Eric I found the parts at Dons Marine Slavage in Clearwater. Dons has several LM318's laying around and all kinds of boat parts and accesories to look through. I have found that a reverse rotation motor has a special distribtor drive and only that one must be used.

Re: reverse rotation engines

Posted: Fri Mar 30, 2018 7:34 pm
by metalmanbret
What am I missing here. Distributors are the same. It's the cam that has the gear reverse ground to make the distributor turn the same direction. Since the cam is turning the opposite direction, the collar is used to keep the distributor from riding up.

Re: reverse rotation engines

Posted: Sat Mar 31, 2018 3:23 am
by bobv
Yes both distributors are exactly the same .There is no such thing as a reversing distributor for these motors. Just check with Prestolite, holly pertronix, you can call Hurrikain Marine . I checked with all of them , the part # for both distributors is the same. Do not waist your time looking for a reversing distributor, It simply does not exist.
Bob

Re: reverse rotation engines

Posted: Sat Mar 31, 2018 7:13 am
by Fastjeff
Reverse Rotation Distributor.JPG
Does this look the same as the normal rotation distributor?

Jeff

Re: reverse rotation engines

Posted: Sat Mar 31, 2018 10:14 am
by Harryb
The gear that drives the distribtor and the oil pump is different and only a reverse rotation one will work for a reverse rotation motor.

Re: reverse rotation engines

Posted: Sun Apr 01, 2018 10:33 am
by bobv
Pull that collar off it is the exact distributor. That collar is not part of that distributor you must reove it and use it on the new distributor.If you can find a part # for this so called reversing distributor please share it .
You can check with every manufacturer the cw and ccw motors use the exact part #. I know I have done my reserch.I have also pulled the distributor off the cw motor and put it on the ccw motor.They are the same!!!!
Again if you can find a part # that is different for a reversing distributor,please share it.I assure you that you will not find one because it does not exist.
Btw the gear on that distributor is exactly the same as the other one.
Bob