LM 318 Raw Water Cooling System with Sherwood D65
Posted: Fri Apr 16, 2021 1:02 pm
After much time trying to find the easy answer for 'proper' factory plumbing routing on my '73 F31 with dual Chrysler LM 318s, RWC, Velvet drive 1:1 trannys, its time to just 'figure it out' and ask for a second set of eyes, agreement or disagreement.
Background: Boat new to me last year, still working out all the kinks and understanding all the systems. PO owned 2 years and its fair to say never took engines over a slow idle for various reasons, primary being loose throttle cable connection at the helm that simply wouldn't grab the butterfly's before the lever was max'ed out! Amongst other things... Anyway.. Pushing the engines harder now and its time to validate the cooling system.
First indication I needed to understand everything better was Port engine had the input to Sherwood pump on the the opposite as the Star. Second indication is the service manual only speaks of a single impeller RWC System.... Hence confusion.
Again, on the Star engine the 2 lines are the opposite, but all other lines on top of the engine to the t-stat, bypass, to the manifolds, etc seem routed the same. Im trying to make sure the tranny is getting the proper cooling, and that the routing of the system makes sense.
My next step is to add in clear pvc sections at all the joints to understand the current flow path, and modify as necessary from there.
To be objective, what I do not understand most is that the tranny oil cooler being fed off what i think is the "input" side of the dual pump... I guess my lack of pictures of the tranny oil cooler plumbing is racking my brain, and hopefully i can get to her this weekend. Referencing this post, I continue to believe all makes sense on the 'top' of the engine.
viewtopic.php?t=6508
and the second image of the RW system... I get confused on how water is getting to the OC!!
(To be continued... im going to continue to edit and add to this post, saving drafts looses the pictures!)
Background: Boat new to me last year, still working out all the kinks and understanding all the systems. PO owned 2 years and its fair to say never took engines over a slow idle for various reasons, primary being loose throttle cable connection at the helm that simply wouldn't grab the butterfly's before the lever was max'ed out! Amongst other things... Anyway.. Pushing the engines harder now and its time to validate the cooling system.
First indication I needed to understand everything better was Port engine had the input to Sherwood pump on the the opposite as the Star. Second indication is the service manual only speaks of a single impeller RWC System.... Hence confusion.
- D 65 with outlet connections disconnected.
- D65 remove).jpg (56.38 KiB) Viewed 6386 times
- Spare Sherwood D65 showing confusing casting callouts
- IMG_0155_2.png (402.69 KiB) Viewed 6386 times
- Port Engine
- port engine.jpg.png (601.36 KiB) Viewed 6386 times
To be objective, what I do not understand most is that the tranny oil cooler being fed off what i think is the "input" side of the dual pump... I guess my lack of pictures of the tranny oil cooler plumbing is racking my brain, and hopefully i can get to her this weekend. Referencing this post, I continue to believe all makes sense on the 'top' of the engine.
viewtopic.php?t=6508
and the second image of the RW system... I get confused on how water is getting to the OC!!
(To be continued... im going to continue to edit and add to this post, saving drafts looses the pictures!)