MarineEngine.com does not offer troubleshooting assistance or repair advice by email or by telephone.
You are invited to join our public Boat Repair Forum to seek assistance from other members.
You may also visit the Boat Motor Manuals section of our site to obtain a service manual.
Thanks I can be sure it does not go that high!! MikeI did new risers and elbows. I have not filled heat exchanger yet. I was just wandering what is the high side for temperature would be with out causing damage.
How hot can I take the exhaust manifolds too before damaging something?99% of the time, you will need to run a couple heat up - cool down cycles to purge the air from the cooling system....the manifolds and the heat exchanger will be a hotter than the t-stat opening point...how much depends upon the load on the engine.
I'd think you got close to opening the t-stat after the engine was shut off...check the level in the heat exchanger when it is cool and son't be surprised if it has dropped a good bit...refill and then repeat until the coolant level stops dropping...
Top of exhaust manifold is 180 degrees and the side of manifold is 160. With out a load. Going for a sea trial tomorrow and check again under load. Do those numbers seem close to being right ?I'd say 210 deg F, on the manifold, where the cooling jacket is, would be a reasonable limit, with no load on the engine.
The thermostat has not been changed in many years. Should I put a new one in now before I seatrial boat.they are within reason....the inlet to the manifold should match the t-stat outlet and the outlet from the manifold will be hotter...the temp will vary with engine load and water flow ...
It was too windy today for sea trial. I will update this weekendIf the one that's installed is working, there's no need to change it...
i don’t believe it has been serviced. You think it’s the pump rather than the thermostat. It will run normal temp for first 8-10 miles then it crepes up after that and stabilizes a little warmer than normalok...when was the last time the raw water pump had the major service kit installed?
there are other 'wear parts' that need to be changed to keep the pump working at max efficiency - the cam in particular. If it has noticeable wear, the pump won't deliver all of the water it is supposed to....
The other item is the HX - any idea if it has ever been checked/cleaned?
Thanks I will check all the little things this weekIt could be the pump....not saying that it is...could also be little things - sea cock not open fully, strainer cap not fully seated, hose clamp on the suction side not fully tightened...as well as the cam or wear plate in the pump being worn...
If it runs 'normal' for "first 8-10 miles", to me that sounds like the t-stat is fine....and after the 10 miles, the temp crepes up because not enough heat is being removed thru the heat exchanger...which could be caused by the cooling water being marginal (volume) or if it gets aerated (not a solid flow of water)...
FWIW, keeping a log book, with all of the little maintenance details, can help tremendously in the future when sh*t happens again....
Weird thing is the first time I took it out this year I put 50 miles on her and was perfect. It happened second time I ran her after 7 miles temp crept up.Thanks I will check all the little things this week
$1000 question ??? I will find itthat begs the question: What happened between the end of the first trip and the second trip?
Yes I made sure that they were right.One other question: when you did the elbows/risers, did you make sure the 'tabs' on the gaskets were in the proper position and the proper type (1-slot vs 3-slot)?
I cleaned /flushed the heat exchanger today was dirty with some scale. Have not sea trialed do to weather. I do notice that the engine warms up a lot faster than the other. Does that mean anything? Where they used to be equal.good deal...
The motor heats up much faster to 150 ish than my other motor. They used to rise about the same .not usually...what do you mean by "...a lot faster..."?
Normally, cleaning the HX will allow it to transfer heat better to the cooling water...and that normally stretches out the time for the t-stat to open .... but not by more than a minute or two...