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post #15 of Old 08-03-2013
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Location: Sarasota
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Re: Confused about which oil weight to use

Thanks again, it sounds like I need to check the water thermostat.
The starter had broken once before (About 6 months ago) due to, trying to get the motor started with ether. I had been having some problems with starting and a mechanic got it started with ether once. Well, somehow, it was too much, and cracked the starting casing. on that starting effort. (Now, don't laugh too loudly at my ignorance). I am just learning diesels, for the first time.
So, that was the reason the starting cracked. The motor has run fine, (for some reason I cannot explain, and started on first turn of the key ever since; except for the recent episode of getting hot, at idle. (The motor did, once, have the warning heat alarm sound off a month ago), when my wife got confused on which way the thru haul raw water intake valved turned. She turned it off, and thought she had turned it on). So now, I have drawn a picture beside the thru haul valve for the raw water for ON and OFF positions. But, on this occasion, the warning heat sensor alarm did not sound off. I am wondering if a plastic bag might have been sucked to the the outside of the raw water intake. But, now, it could be the thermostat needs checked. I have since, ran the motor for over 20 hours, with over 15 different starts, up and down the ICW in Florida, travelled over 70 miles, and have not had the least bit of motor problem. But, I was glad to have ordered the extra starter (since I switched it out, in 20 minutes and was going again), without needing to call for a tow.
Is it much work to pull the head? I have never done it. And I guess the pattern of re-tightening the headbolts and the torque is in the manual? Right? And, what does scarring look like on the cylinders? Are there any pics on youtube that show a scarred cylinder. Wouldn't I have to pull off the block in order to replace the rings? Does a compression test simply tell me if the rings are shot? It still starts easily now on the first turn of the key.
Is that a good indicator of good compression? The rating of the 3GMD is 20 HP at 3400. The RPM goes to 3600, when running at full throttle. And I move at 7.3 knots. Haul speed is 7. Thanks so much!
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