6.5 Westerbeke 20 min shut down,Steam....

[Wardy549]

ok so I have Im guessing an 88 6.5 westerbeke. She would start throwing white smoke ( im thinking steam) and then shut down after about 20 minutes. The previous owner put in a new impellor soo... I noticed my exhaust hose and two others where leaking water. So I replaced them all. Started her up and the same thing. Also didnt seem she was spitting water out as much as she should. Sooo, I took the one side heat exchanger cap off. Bam! Pieces of the old impellor where inside.. I got them all out and was sure she was going to run now. Nope, same thing. After a few minutes more white smoke, then 20 minutes in shut down.
Can anyone give me any suggestions.
Thanks in advance!

 

[PlayDate]

Have you checked the water intake and the strainer?

Even if the strainer is clear.....open the seacock with the cap off. Water should freely overflow the strainer. If it does not:

-Close the seacock
-Remove the hose attached to the seacock
-Using a 3/8” wood dowel rod....insert it into the seacock and open the seacock. Push the rod up and down to clear any blockage. Water should freely flow.
-Close the seacock, attach the hose and test water flow to the strainer.

That should solve the problem if the heat exchanger is clear of blockages.

 

[Wardy549]

Have you checked the water intake and the strainer?

Even if the strainer is clear.....open the seacock with the cap off. Water should freely overflow the strainer. If it does not:

-Close the seacock
-Remove the hose attached to the seacock
-Using a 3/8” wood dowel rod....insert it into the seacock and open the seacock. Push the rod up and down to clear any blockage. Water should freely flow.
-Close the seacock, attach the hose and test water flow to the strainer.

That should solve the problem if the heat exchanger is clear of blockages.

I did exactly that and yep the water flow became better but still shutting down..

 

[marty51]

I did exactly that and yep the water flow became better but still shutting down..

Check the hose from lmpellar to exchanger

 

[Ricochet]

Try this....There should be a small hose from the thermostat hosing to the exhaust manifold, it lets a small amount of water through to keep the exhaust manifold cool until the thermostat opens....it may be plugged. I chased a similar overheating problem for a couple of years had several mechanics look at it replaced several parts , hoses etc. finally after much reading I discovered this hose. I think the hose was 7'' long and same size as a gas line. once I replaced it I have had no issues.

 

[Wardy549]

So I did all kinds of stuff including checking that impellor and pump shaft. All seemed solid. Found more pieces of old, very small. So all said and done, I check the oil. It was low this time but seemed clean. Took the cap off to put new oil in and dam, milk looking shit on the cap. God I know thats bad... cracked block or hopefully just the head leaking? If the block was cracked wouldnt the oil in the pan be milky too?
Guess ive got a job ahead...

 

[dtfeld]

Have you cleaned the heat exchanger? Pull it off and open it up. Its could be blocked up. You can pickle it yourself and clean out the tubes. Easy 2 hour job and maybe a $30 bottle of barnacle buster. I'd start there next.

If the boat has not been used, just normal temperature fluctations can put some moisture in the crankcase, but it should boil off.

Get good water flow first.