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Old 16-01-2016, 08:32   #1
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Westerbeke 52: New fuel injector pump = overheating

Our W52 with 5500hrs started overheating above 2150 rpms (190 deg) after the fuel injector pump was recently replaced. I read the above thread on the Yanmar overheating and picked up a couple of suggestions (majority had already been done).

But since this was not a problem before the fuel injector pump was replaced, any ideas on what the connection would be?

Thanks
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Old 25-04-2017, 11:29   #2
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Re: Westerbeke 52: New fuel injector pump = overheating

I have my fuel injection pump out of my W52right now and am reading your thread for ideas.

Could this be related to the pump timing? i.e., if the ignition is slightly advanced or retarded could that cause overheating? That's the only thing I could think of assuming the pump was serviced correctly.

I'd be interested in hearing iof you figured this out and what your final diagnosis/solution was.
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Old 25-04-2017, 12:15   #3
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Re: Westerbeke 52: New fuel injector pump = overheating

Advanced timing can / will cause overheating, usually hard starting too as in starter spins it slower than it used to, reason is the ignition is occurring too soon and kicking the piston in the face prior to TDC, old hand start cars for example you retarded the timing to start, or you got hurt when it kicked back
Retarded timing can / will cause low power.

However there should be enough reserve cooling capacity for your system to absorb the extra heat so even if it works out to be too advanced timing, still should look at your cooling system
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Old 25-04-2017, 21:15   #4
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Re: Westerbeke 52: New fuel injector pump = overheating

I was called in to diagnose and repair a Detroit Diesel that was overheating. It was the middle of salmon season and this was a party head boat. The owner was loosing money every day the boat was tied to the dock. Long story short, I went through all the obvious,
sea suction strainer, water pump impeller, heat exchanger. Water flow over board was good. Turned out the guy who overhauled the motor missed the timing gear marks and got the cam 4 teeth advanced. That worked out to 26 deg advance with the exhaust valves closing way to soon before the inlet ports were able to sweep the cylinders with fresh air. I found this by running a dial indicator on the unit injector of # 1
cylinder and measuring plunger travel before TDC. Took about a week of work to pull transmission, bell housing, flywheel and gear housing to verify and reset gear timing.
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Old 25-04-2017, 21:49   #5
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Re: Westerbeke 52: New fuel injector pump = overheating

The timing marks on my W52 are not visible. Westerbeke's motor mount bracket obscures the engine manufacture's timing marks on both the timing case and the injection pump. I punched my own marks on the motor mount bracket and injection pump flange prior to the pump's removal so I can reinstall it with the correct timing.

If no new marks were made, the pump would have to be timed (per the Westerbeke Tech manual) by freeing a valve to rest on the piston and using dial indicator on the valve and a second dial indicator on the injection pump - a much more involved procedure.

Is it possible the pump was reinstalled without new timing marks or without using the dial indicator technique Westerbeke specifies? If so, perhaps the pump was installed close enough so that it only overheats at higher RPMs? A marginal cooling system like what might be seen on a older engine would likely be really taxed in this scenario as well.
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Old 05-05-2017, 11:23   #6
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Re: Westerbeke 52: New fuel injector pump = overheating

Quote:
Originally Posted by Nord Sal View Post
I have my fuel injection pump out of my W52right now and am reading your thread for ideas.

Could this be related to the pump timing? i.e., if the ignition is slightly advanced or retarded could that cause overheating? That's the only thing I could think of assuming the pump was serviced correctly.

I'd be interested in hearing iof you figured this out and what your final diagnosis/solution was.
Hello,
Sorry for the delay in replying. We are in the Bahamas with sketchy internet.

The timing on our pump was set by the mechanic who rebuilt the pump so when reinstalling we just had to align the slot correctly.

We have been bothered by overheating for awhile. We did a baseline temp of 22 spots on the engine and took that spreadsheet to a mechanic. He suggested the heat exchanger might be a problem. We had recently had the HE serviced, but the mechanic thought it may just be old, fatigued, and not doing it's job well.

We bought another HE and were quite surprised to see that the new one was 3 inches longer than the one installed. Our guess is previous owner made the replacement with an undersized unit.

That did the trick for us. We also now use a digital thermometer to take engine temp readings as our temp gauge on the panel routinely runs 5 degrees hotter than engine actually is (even after replacing the gauge, sender, and wiring).

This forum was a great help when we had to remove the pump ourselves. I hope you find some answers that help you too.
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