OzzyToo
New Member
- Jan 21, 2016
- 5
- Boat Info
- 1979 SRV 300 Weekender, original electronices
- Engines
- Twin Chrysler Marine 440
Hey all!
I just acquired a 79 weekender 300 and have been tinkering with it so we can get it out on the water. Still a couple issues to sort out but figure I'll post and see what kind of solutions are out there.
For her age she is in great shape except for the odd quirk which we are trying to iron out.
First issue is the port engine is overheating at idle. What we have done so far is replace the impeller on the raw water pump as the last one was shredded. We checked all flow from the through hull and even back flushed the system.
We have a jabsco on this engine. We also swapped it with the starboard side pump which is now Sherwood. Both work on stbd but engine also idles too fast but that'll be another thread.
We we got it to the point of the pump working at a higher rpm. So at idle we sit around 700rpm and no water flow. Increasing the rpm to 1200 we get water flow. Enough to maintain temperature but not enough to cool down. We can maintain the temp at around 180 which is a bit higher than ideal operating temp. But once we drop the rpm it starts climbing quickly.
Could it be an advanced idle that keeps it revving low and not pulling water? The pump flow at 1200 rpm seems a bit weak but is flowing like a garden hose. But at 700 nothing. What's the proper flow rate?
Thanks for the look
I just acquired a 79 weekender 300 and have been tinkering with it so we can get it out on the water. Still a couple issues to sort out but figure I'll post and see what kind of solutions are out there.
For her age she is in great shape except for the odd quirk which we are trying to iron out.
First issue is the port engine is overheating at idle. What we have done so far is replace the impeller on the raw water pump as the last one was shredded. We checked all flow from the through hull and even back flushed the system.
We have a jabsco on this engine. We also swapped it with the starboard side pump which is now Sherwood. Both work on stbd but engine also idles too fast but that'll be another thread.
We we got it to the point of the pump working at a higher rpm. So at idle we sit around 700rpm and no water flow. Increasing the rpm to 1200 we get water flow. Enough to maintain temperature but not enough to cool down. We can maintain the temp at around 180 which is a bit higher than ideal operating temp. But once we drop the rpm it starts climbing quickly.
Could it be an advanced idle that keeps it revving low and not pulling water? The pump flow at 1200 rpm seems a bit weak but is flowing like a garden hose. But at 700 nothing. What's the proper flow rate?
Thanks for the look
