Running warm or not?

[post42]

I have 735 h.p. 892's . When cruising at 1800 -1900 rpm's my starboard temp gauge reads up to 245 degrees. The gauge in the engine room, which I believe is mechanical, reads 185. The port reads around 185 on both gauges( bridge and engine room). Correct me if I'm wrong but there is no way the gauge reading 245 could be correct. Wouldn't I blow the engine or do serious harm? It runs fine and keeps good oil pressure. What do you guys think? Is it usually a gauge or a sending unit? What should I change? Thanks for any advise you can give.
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[SKYCHENEY]

That reading is obvisouly wrong. Swap the gauges at the helm first or use some jumper wires. This will tell you if it is the gauge or the sender that's acting up.

[MikeP]

Yes, it's definitely the gauge! The mechanical eng room gauges are the only ones to pay any attention to.

Does it start at a low reading and steadily climb as the engine warms up? If so, kinda sounds like the wrong sender for the gauge; has it always done this or did it just start acting this way?

[Genesis]

The gauge is obviously hosed.

However, 185F is the TOP of the safe range. I would investigate that; ideally you want to run in the 175-180F range at cruise.

[post42]

Thanks for all the advise. Karl I'll look into that. I just bought all new power cool so I'm going to flush and fill with new. I'll keep you posted.
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[Genesis]

THe problem is almost certainly on the raw water side. See my "on engine cleaning" procedure posted here in the tips section if you want an easier alternative to pulling the H/E cores. It may or may not do the trick, but it sure is easier than ripping the system apart.

[post42]

Karl I was wrong. Ran the boat again today and the mechanical gauges in the engine room were reading between170 and 175. Actually closer to 170. That actuallyseems cold to me.
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[Boss Lady]

Karl I was wrong. Ran the boat again today and the mechanical gauges in the engine room were reading between170 and 175. Actually closer to 170. That actuallyseems cold to me.

Count your blessings, 185 is the do not exceed temperature. What rpm do you cruise at?

[post42]

I cruise between 1800 and 1900. I'm reluctant to go under 1800 because I don't want to lug them. Or at least I've read I should not lug them.
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[krush]

I cruise between 1800 and 1900. I'm reluctant to go under 1800 because I don't want to lug them. Or at least I've read I should not lug them.

This is not the first time I've heard this. People don't want to lug the engines, but my engineering backround disagrees slightly. Doesn't a prop just absorb the power u put into it? I've heard of overloading occurring on large diesel engines in ferries because the captain likes to "slam" the throttles, but is running at 1/2 throttle really "lugging"? If the prop acts like a pump, it absorbs whatever power is transfered to it.

I don't know, I could be completely wrong, but I think if you measured the toque in the shaft and the load on the bearings, it wouldn't be any more at lower RPM than higher.



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