Hi all,
I'll try to keep the story part short and to the point.
I have a cabin cruiser appolo with a OMC cable shift stinger, and Ford 302 V8. I just replaced the seals and impeller in the sterndrive with the shafts (yes they were stripped) and got it back on the water after quite a long story.
Saturday, everything ran great, however I did get into a bit too shallow of water at one point and didn't notice right away. However, it ran fine rest of the day and ran another 2-1/2 to 3 hours. May have got some sand in there though (insert cursing at myself here...)
Sunday it ran great all day morning, actually came across another boat with his family stranded on river, towed them to closest ramp, got back on track down river and slowed down for a 5 mph zone, and noticed it got hot. Shut her down and anchored.
Disconnected the hose from the sterndrive into the engine compartment (after it cooled a few hours) and quickly tested flow with fast start - great flow. Noticed I also have a Jabsco 2620 belt driven pump. Again long story short I found the flow was restricted through that Jabsco pump and bypassed it to get home. It ran great 2-1/2 hours back to my boat ramp, idle and 3500 rpm consistent @ or under 140 degrees on dash gauge.
I can rebuild the pump, good there, my question is just what is the purpose of this instant prime additional pump? Is it a redundant extra to ensure good upward flow from the bottom of the engine compartment to the top thermo tree distribution? It seems to be a 3 pump system - sterndrive impeller, this jabsco 2620-1001 and the "regular" water pump for feeding through the engine block.
I couldn't find great reference to it anywhere in cooling system diagrams. My service manual got half eaten by rats (another long story). Need to grab a new one.
Thanks for your time.
Cheers - Jr
I'll try to keep the story part short and to the point.
I have a cabin cruiser appolo with a OMC cable shift stinger, and Ford 302 V8. I just replaced the seals and impeller in the sterndrive with the shafts (yes they were stripped) and got it back on the water after quite a long story.
Saturday, everything ran great, however I did get into a bit too shallow of water at one point and didn't notice right away. However, it ran fine rest of the day and ran another 2-1/2 to 3 hours. May have got some sand in there though (insert cursing at myself here...)
Sunday it ran great all day morning, actually came across another boat with his family stranded on river, towed them to closest ramp, got back on track down river and slowed down for a 5 mph zone, and noticed it got hot. Shut her down and anchored.
Disconnected the hose from the sterndrive into the engine compartment (after it cooled a few hours) and quickly tested flow with fast start - great flow. Noticed I also have a Jabsco 2620 belt driven pump. Again long story short I found the flow was restricted through that Jabsco pump and bypassed it to get home. It ran great 2-1/2 hours back to my boat ramp, idle and 3500 rpm consistent @ or under 140 degrees on dash gauge.
I can rebuild the pump, good there, my question is just what is the purpose of this instant prime additional pump? Is it a redundant extra to ensure good upward flow from the bottom of the engine compartment to the top thermo tree distribution? It seems to be a 3 pump system - sterndrive impeller, this jabsco 2620-1001 and the "regular" water pump for feeding through the engine block.
I couldn't find great reference to it anywhere in cooling system diagrams. My service manual got half eaten by rats (another long story). Need to grab a new one.
Thanks for your time.
Cheers - Jr
