I have an Onan 7.5KW diesel genset. I've run it for probably 3+ hours total. Friday morning it ran great for over an hour, cooked breakfast on the electric stove, heated up the hot water and charged the house bank some.
Friday evening I fired it up again and started to load it up. After a few minutes I decided to check the coolant flow out the exhaust. Barely a trickle!
I shut it down quickly and opened the engine compartment. It smelled hot and there was a bit of smoke in the air. Assuming a coolant flow issue, I left it off until I could troubleshoot some more.
Today I checked the strainer basket. No problem. Pulled the hose off the thru-hull, full flow of water. Pulled the hose off the raw water pump and was able to easily blow air in and heard it bubbling up from the thru-hull on the outside. Pulled the other hose off and blew through the heat exchanger and aqua-lift muffler, felt no restriction at all. Put the hose from the intake side of the pump down in the bilge, opened the sea cock and verified it flowed freely.
The belt looked a little loose, but it didn't appear to be slipping.
Took the pump apart, checked the impeller. Looked great. I found the box it came in, mfg date of July 2012, which confirms what the PO told me that it had been replaced as part of general maintenance late last year.
Put everything back together, including tightening the belt. Ran for 5 minutes. A little dribble out the exhaust, but no more. Shut it down.
Came back an hour or two later, checked all the hoses, made sure the supply hose was full of water, and fired it up again. Still just a dribble after 5 minutes.
Could it be I need to let it run longer to fill up the muffler? I'm running out of things that could be restricting the flow.
Friday evening I fired it up again and started to load it up. After a few minutes I decided to check the coolant flow out the exhaust. Barely a trickle!
I shut it down quickly and opened the engine compartment. It smelled hot and there was a bit of smoke in the air. Assuming a coolant flow issue, I left it off until I could troubleshoot some more.
Today I checked the strainer basket. No problem. Pulled the hose off the thru-hull, full flow of water. Pulled the hose off the raw water pump and was able to easily blow air in and heard it bubbling up from the thru-hull on the outside. Pulled the other hose off and blew through the heat exchanger and aqua-lift muffler, felt no restriction at all. Put the hose from the intake side of the pump down in the bilge, opened the sea cock and verified it flowed freely.
The belt looked a little loose, but it didn't appear to be slipping.
Took the pump apart, checked the impeller. Looked great. I found the box it came in, mfg date of July 2012, which confirms what the PO told me that it had been replaced as part of general maintenance late last year.
Put everything back together, including tightening the belt. Ran for 5 minutes. A little dribble out the exhaust, but no more. Shut it down.
Came back an hour or two later, checked all the hoses, made sure the supply hose was full of water, and fired it up again. Still just a dribble after 5 minutes.
Could it be I need to let it run longer to fill up the muffler? I'm running out of things that could be restricting the flow.