Seawayva
Lieutenant Commander
- Joined
- Feb 7, 2012
- Posts
- 224
- Likes
- 45
- Location
- Alexandria, VA
- Boat Make
- Tripp Angler 22' Flush Deck Cuddy
This summer I had my turbo rebuilt on a Yanmar 4lha - STP. After we got it back in the boat ran fine with no problems. Temperature was right and the performance was up a little. Probably put about 15 hours on the boat since.
Cut to yesterday when I took the boat out to fish. It was very foggy so I was going about 7 knots (14-1500 rpm) for about 4 minutes when the temperature gauge went from about 140 to about 200 very quickly. Cut the engine back to idle and opened the engine box and saw no obvious problems. The gauge then fell back to about 160. Turned around and idled back to the dock. On that 5 to 7 minute trip the gauge went to 180 and stopped.
Upon checking the coolant in the engine I discovered it was low. By two gallons. Filled it back up and today started the engine. Coolant is coming out of the exhaust at high idle at the dock.
Trying to isolate the cause.
Bad seal in the turbo? That is my hope (unless something less labor intensive and wallet intensive is the case) as it is the only thing that has been altered and the rebuild is under warranty.
Other thoughts?
A mechanic is going to pressure test the cooling system to verify. I assume when this is done if the turbo is bad coolant will pool or pour from it on the exhaust side?
Thanks for any help.
Matt
Cut to yesterday when I took the boat out to fish. It was very foggy so I was going about 7 knots (14-1500 rpm) for about 4 minutes when the temperature gauge went from about 140 to about 200 very quickly. Cut the engine back to idle and opened the engine box and saw no obvious problems. The gauge then fell back to about 160. Turned around and idled back to the dock. On that 5 to 7 minute trip the gauge went to 180 and stopped.
Upon checking the coolant in the engine I discovered it was low. By two gallons. Filled it back up and today started the engine. Coolant is coming out of the exhaust at high idle at the dock.
Trying to isolate the cause.
Bad seal in the turbo? That is my hope (unless something less labor intensive and wallet intensive is the case) as it is the only thing that has been altered and the rebuild is under warranty.
Other thoughts?
A mechanic is going to pressure test the cooling system to verify. I assume when this is done if the turbo is bad coolant will pool or pour from it on the exhaust side?
Thanks for any help.
Matt