I had a pre-purchase survey
done and the surveyor
said the Yanmar
3HM35F was running a little hotter than usual. He checked the temperatures in several places using an infrared temperature gun. The exhaust
hose temp just below the elbow
pan, oil filter
, and injectors all were about 15-20 degrees hotter than what he said they should be, but the coolant
temperature checked at the thermostat was normal (about 140F if I recall). The injectors were about 160F - all three were about the same, I think the oil
temp at the pan was about 185F and the exhaust
hose just below the elbow
was about 118F. Can't remember the exact temps - mainly that everything but the coolant
was 15-20 degrees too high.
seemed to think it was an indication that maybe the exhaust elbow was beginning to clog.
Any ideas about what would explain the engine
and exhaust temps to be high but the coolant temp to be normal?