| Author |
Message |
    
Ben Sidaway
Member
Username: b_sidaway
Post Number: 7
Registered: 08-2011
| | Posted on Tuesday, June 13, 2017 - 05:07 pm: | 
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My P-60 has a weird overheating issue. My Pearson 33 is on the hard so I put the raw water intake in a bucket of water. Initially the engine sucks up some water and discharges out the exhaust but after a few minutes of running the engine stops sucking water and engine starts to overheat. I have taken off the water inlet fitting from the water pump to the engine and cleaned the scale out. 2 years ago this was completely clogged. (Rebuilt engine 10 yrs ago). Water pump is working fine. Put thermostat in pan of hot water and it opened. Tried running engine without thermostat - exactly same pattern of initial uptake of water and then stopped. Hooked up shop vac and blew down thermostat outlet pipe. Air and residual water came out exhaust. The rubber hoses to the water pump from the bucket get hot as does the return from the engine to the bucket. Water in bucket gets very hot before I shut the engine off. Can't figure out where the issue is. Any help will be greatly appreciated. |
kevin stone
Senior Member
Username: kdstone
Post Number: 76
Registered: 01-2009
| | Posted on Tuesday, June 13, 2017 - 06:59 pm: |
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Maybe try back flushing the engine and manifold with pressure water. Also consider a possible acid or vinegar flush. It sounds to me like you still have crap floating around that is blocking raw water flow. |
Ben Sidaway
Member
Username: b_sidaway
Post Number: 8
Registered: 08-2011
| | Posted on Tuesday, June 13, 2017 - 10:46 pm: |
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Kevin, how exactly would I back flush the engine. I have poured water into the steam vent on top of the head and it comes out the inlet fitting on the block. |
Ben Sidaway
Member
Username: b_sidaway
Post Number: 9
Registered: 08-2011
| | Posted on Wednesday, June 14, 2017 - 12:06 pm: |
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I think I have figured out my over heating issue. I took off the return hose to the raw water inlet and water came gushing out so the issue was not a clogged block. Even with the thermostat removed no water comes out the exhaust however. I put a plumber's snake into the exhaust discharge and found it quite clogged with 45 yrs of carbon build up. I could get it through to the manifold but with resistance. I can't figure out an easy way to clean out the copper exhaust pipe. Could I cut out the middle 3/4 of this exhaust pipe and replace it with a rubber wet exhaust pipe? I broke off the water inlet fitting to the copper exhaust and so I plan on plugging that hole and making a fitting into the new rubber exhaust pipe. Would this work, any problems with the solution? |
kevin stone
Senior Member
Username: kdstone
Post Number: 77
Registered: 01-2009
| | Posted on Wednesday, June 14, 2017 - 01:07 pm: |
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I assume you are talking about the hot exhaust section. Rebuild it with black iron pipe. Not galvanized. Very easy to do and readily available. Dont use rubber exhaust hose until after the water injection point. |
Ben Sidaway
Member
Username: b_sidaway
Post Number: 10
Registered: 08-2011
| | Posted on Thursday, June 29, 2017 - 11:33 pm: |
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Thanks for your advice. I ended up pouring some gas into the exhaust pipe and using a plumber's snake to scour out the soot in the exhaust pipe. Water flows through nicely now. Now I just have to replace the head gasket and I'll be good to go. |
