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On 18 May 2004 08:40:40 -0700, (Eldon Cutlip)
wrote:

"Greg O" wrote in message ...
"Eldon Cutlip" wrote in message
om...

So, I was thinking I must need have a semi-bad impeller in both motors
at this point. So, I just took apart the lower unit and pulled the
water pump on the cold motor. The impeller looked fine - no wear or
tear and still quite bendy. The inside of the water pump lining
doesn't have any scratches. So now I'm totally out of ideas.

Replace the impellers. even if they look good they may not be. A few years
ago my dad was up in Canada fishing and the engine was running hot. Removed
the leg and "flipped" the impeller over. The engine ran fine the rest of the
trip. The impeller got changed ASAP!
Greg

I replaced the water pump in the "cold" motor - or at least the one
that was cold originally After that, I had just enough time to
idle it for 5 or 10 minutes on the ears. It settled right at the mark
between the green and red. I didn't have a chance to get the other
engine's water pump done yet or to take the cold one out on the water.
But something still seems wrong even with the cold motor. I think I
will have to buy one of those laser temperature things. And I think
someone had mentioned that the oil to fuel mixture may be suspect.
Could running too lean cause the engines to run hotter? If so how do
I verify what the oil mixture is set to (these are the VRO Johnson
70's - 1986)? I had two of the local boat mechanics tell me the new
thermostats are the same as the ones I replaced.

So, I think the plan right now is replace the other water pump, get a
laser, and verify the oil mixture. I have no clue how to verify the
oil mixture but I guess I could just put oil in the fuel tank and see
if they stay cooler.

Thanks,
Eldon

Without verifying that both your gauges are accurate and reliable..
....... you could be farting against thunder!