reverse rotation engines

Harryb
Tin star
Posts: 36
Joined: Sat Jul 19, 2014 1:56 pm

reverse rotation engines

Postby Harryb » Mon Mar 26, 2018 12:04 am

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
1987 32 f/b sedan with twin 318's Docked on florida's nature coast

Fastjeff
Site Admin
Posts: 953
Joined: Sat Jul 12, 2014 5:06 am
Location: Rock Halll, MD
Contact:

Re: reverse rotation engines

Postby Fastjeff » Mon Mar 26, 2018 6:11 am

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
"We live at the bottom of an ocean of air, not at the top." General Marvage Slatington

Harryb
Tin star
Posts: 36
Joined: Sat Jul 19, 2014 1:56 pm

Re: reverse rotation engines

Postby Harryb » Mon Mar 26, 2018 8:12 am

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.
1987 32 f/b sedan with twin 318's Docked on florida's nature coast

EWRice
Royal Aluminum Star
Posts: 237
Joined: Thu Feb 04, 2016 12:37 pm

Re: reverse rotation engines

Postby EWRice » Mon Mar 26, 2018 10:39 am

Let me know if you need the parts. I should have a few sets.
Muskegon Lake
1972 32' Express flybridge
"AL13"
Twin 318s
On board air & prime 920
1963 Thompson Super Sea Lancer
Graymarine 327
1961 Alumacraft 12'
'55 10hp Johnson

Harryb
Tin star
Posts: 36
Joined: Sat Jul 19, 2014 1:56 pm

Re: reverse rotation engines

Postby Harryb » Mon Mar 26, 2018 8:05 pm

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.
1987 32 f/b sedan with twin 318's Docked on florida's nature coast

metalmanbret
New poster
Posts: 5
Joined: Tue Aug 12, 2014 8:09 pm

Re: reverse rotation engines

Postby metalmanbret » Fri Mar 30, 2018 7:34 pm

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.

bobv
Tin star
Posts: 30
Joined: Sun Jul 13, 2014 4:31 am

Re: reverse rotation engines

Postby bobv » Sat Mar 31, 2018 3:23 am

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

Fastjeff
Site Admin
Posts: 953
Joined: Sat Jul 12, 2014 5:06 am
Location: Rock Halll, MD
Contact:

Re: reverse rotation engines

Postby Fastjeff » Sat Mar 31, 2018 7:13 am

Reverse Rotation Distributor.JPG
Does this look the same as the normal rotation distributor?

Jeff
"We live at the bottom of an ocean of air, not at the top." General Marvage Slatington

Harryb
Tin star
Posts: 36
Joined: Sat Jul 19, 2014 1:56 pm

Re: reverse rotation engines

Postby Harryb » Sat Mar 31, 2018 10:14 am

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.
1987 32 f/b sedan with twin 318's Docked on florida's nature coast

bobv
Tin star
Posts: 30
Joined: Sun Jul 13, 2014 4:31 am

Re: reverse rotation engines

Postby bobv » Sun Apr 01, 2018 10:33 am

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