New to forum & first post so I hope this is the right place to post my question. Anyhow, recently purchased a 2004 46' Endeavour
with twin Yanmar
4LHA-STP engines. Engines have about 2400 hours. First thing we did after we took delivery
was have our local Yanmar service
center inspect the engines and make any recommendations. He pulled all coolers, replaced any cracked hoses and flushed/cleaned both fresh & sea water
coolers. Inspected all pumps & replaced any worn components. Upon reassembly, we took it for sea trial. Coolant
levels were topped off to "full" on overflow tank and and exhaust
manifold chamber topped off. It takes about 40 minutes to get to channel where we can open up throttles so we putter along at ~2200 RPM
& during this time frame, everything looked good. Once we started cruising at about 3200 RPM
, the coolant
overflow tank began overfilling and after about 90 minutes it was spewing coolant out the vent hole on overflow tank. Also losing power.
Thought it was the exhaust
manifold but upon further inspection
, the turbo was cracked and had excessive radial clearance. That was replaced. Went on another sea trial and same thing happened except no noticeable loss of power, just coolant spewing out of vent hole on overflow tank. Again, this all occurred after about 90 minutes @ 3200 RPM.
So now we think it's the exhaust manifold and pull that and put in new one. Same thing happened. Coolant overflow tank level increases and then starts spewing coolant. All work
being performed by Yanmar. Now he thinks the head
is the issue.
This is only happening with STRBD engine
. Anyone ever seen these symptoms before and if so, what thinks you?
Thanks in advance.