Quote:
Originally Posted by Edelweiss
Also the 120 HP rating you're quoting for a T or HT 6.354M is pretty low. The 6.354M N/A (without turbo) of that era were rated at 130 HP and with turbo, ranged between 160 an 185 HP.
Great engine and with proper care they run forever!!
Good Luck
Larry B
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Agreed!! Turbo 6.354 can go up to 240 HP on the Range 4s. 120 HP sounds very low to me for a 6.354.
First thing I'd do is crosscheck the temps on the FB gages. Do they match? If not, maybe a gage problem. If they do at 120, it might be the temp sensor/sender.
Then I'd check the temp with an IR Temp gun. Every boat should have one and they can be bought for about $25 at Harbor Freight. Check the two engines at the same points and don't forget to check the exhaust water temps. If the engines are operating at comparable temps with the IR gun, then you only have an indication problem. Swap the temp sensors and see if the problem follows the temp sensor.
If the engine is truly running that cool, then I'd chase the other paths suggested here. Don't start throwing parts at it until you now which parts are most suspect. Take a measured, reasoned, logical approach to tracking down the indication issue.