I have Volvo 5.7 GI/DF motors in my boat. Yesterday while underway cruising at 4000 rpm the High temp alarm went off and the motor went into limp mode. The gage was at 200 degrees. I shut it down and limped home on one motor. Pulled the impeller which looked fine and replaced it with a new one. Temp seems to be OK at the dock. I will test ride later this week. My question is, what damage could I have done to the motor due to the high temp and what else should I be checking. It took a while to get the motor started after replacing the impeller. Thanks for the help.
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Overheated starboard motor.
- Thread starter Doral 310
- Start date
"Pulled the impeller which looked fine and replaced it with a new one. Temp seems to be OK at the dock. I will test ride later this week"
The issue here is you have not discovered the problem and that it has not likely been fixed. Perhaps water flow was greatly reduced by picking up a plastic bag or maybe a suction hose is collapsing under higher flow or maybe you are sucking air at a loose or cracked hose but something is begging for attention here.
Sounds like you have skirted any big problems with the initial overheat but finding the problem which caused it will be the harder mission now.
Hope this helps
The issue here is you have not discovered the problem and that it has not likely been fixed. Perhaps water flow was greatly reduced by picking up a plastic bag or maybe a suction hose is collapsing under higher flow or maybe you are sucking air at a loose or cracked hose but something is begging for attention here.
Sounds like you have skirted any big problems with the initial overheat but finding the problem which caused it will be the harder mission now.
Hope this helps
ditto AND ditto!!
You got infrared heat gun? Ck manifolds and risers first.
4K RPM is a bit high for a cruise.
200* ain't a killer but the cause might be. Ck rubber connectors (and any other heat susceptible exhaust component) like alien suggested
You got infrared heat gun? Ck manifolds and risers first.
4K RPM is a bit high for a cruise.
200* ain't a killer but the cause might be. Ck rubber connectors (and any other heat susceptible exhaust component) like alien suggested
Thanks Guys, I will check the complete system this weekend. The old impeller was in there a couple of seasons and a couple of the vanes felt softer then others so I am hoping that was my problem. I think if I had restricted water flow the impeller would have torn apart. As For the RPMs, yes 4000 is high. I usually run at 3200-3500 but it was sooo nice out, I bumped it up a bit.