i have a 1996 DT150S Serial # 15002 - 651116 That is giving me a single over heat buzzer with the temperature light staying on. I have read a lot of conflicting information on many different forums. For example, several mentions of a poppet valve under the right side of the cylinder bank. I don't see any thing under the right bank of cylinders in the back of the motor inside the cowling that is removable to change out a sticking poppet valve or anything for parts either in any of the service manuals or parts diagrams.
The Cyl Head Bolts are starting to turn a gulden color which in my opinion tells me the bolts are getting hot causing the clear coating to turn colors. I have had this intermittent over heat buzzer going off problem at low RPM's for as long as I have owned the boat. The engine was immaculately clean when I got it so I would suspect the engine was taken care of pretty good. I purchased the boat with this engine back in 2006 and have been having this alarm issue since purchase. It does not Alarm at high RPM as far as I can recall. Only at lower RPM's like idle or just on plane at about 23-25 MPR. The engine is on a 1994 18' Charger Bass boat. Not that it matters but figured I would mention it just in case it does matter.
I would like to get to the bottom of this. I don't have the exact service manual for this but I do have Service Manual 99500-87D08-01E Which is kind of confusing as well since it dives into several different sizes and years and nothing specific to my engine as far as I can tell.
Any help would be great. Possibly I should start another thread???
The Cyl Head Bolts are starting to turn a gulden color which in my opinion tells me the bolts are getting hot causing the clear coating to turn colors. I have had this intermittent over heat buzzer going off problem at low RPM's for as long as I have owned the boat. The engine was immaculately clean when I got it so I would suspect the engine was taken care of pretty good. I purchased the boat with this engine back in 2006 and have been having this alarm issue since purchase. It does not Alarm at high RPM as far as I can recall. Only at lower RPM's like idle or just on plane at about 23-25 MPR. The engine is on a 1994 18' Charger Bass boat. Not that it matters but figured I would mention it just in case it does matter.
I would like to get to the bottom of this. I don't have the exact service manual for this but I do have Service Manual 99500-87D08-01E Which is kind of confusing as well since it dives into several different sizes and years and nothing specific to my engine as far as I can tell.
Any help would be great. Possibly I should start another thread???
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