G
greaseball04
Guest
"I am the process of putting
"I am the process of putting '81 140 Johnson together. Basically I got the motor for next to nothing so I decided to try and figure out what is wrong or not. The motor runs fine but smokes like an SOB. (Compression across the board is 120 lbs) Upon further investigation (pulling the power head)I determined that that the cause for the smoke was a broken crankshaft (just above the spline opening allowing for a 3/4 inch piece missing from the crank where it is supposed to ride on the lower crank seal, it looked some idiot dropped the powerhead on the lower crank bearing/seal housing, breaking both the housing and a piece from the crank at the same time). When running, the motor would spew intake or exhaust gas past the seal and directly out the bottom of the powerhead making for a messy test tub, massive amounts of oil/fuel. I got an excellent cheap replacement crank off Ebay, split the case, installed and viola no excess blow-by smoke. Runs 100% better. One head seemed to run hotter than the other (this motor has been punched out .020) I decided to pull the heads off (I didn't do originally 'cause to compression was acceptable, I just put in the new crank) to see if there was any restriction to water flow that might account for the difference in temp (I previously tested and cleaned the thermostats and they were fine, and there is excellent tell tale water). Upon pulling the heads I noticed that in the water passages just to left and right of the mid point of the Siamese (mid point of the bore) there is some rubber hose inserted about a 1/2 inch long forming, if you will, a dam or obstruction in the cooling jacket in the block. There is two of these obstructions on either side of the V-4. What gives? Is this some service trick to baffle the water flow and increase cooling efficiency or is this some bandaid measure to fix something else. I have looked at the seloc manual and no where does it describe this technique. Any "Old-Boy Omc Techs" heard if this?"
"I am the process of putting '81 140 Johnson together. Basically I got the motor for next to nothing so I decided to try and figure out what is wrong or not. The motor runs fine but smokes like an SOB. (Compression across the board is 120 lbs) Upon further investigation (pulling the power head)I determined that that the cause for the smoke was a broken crankshaft (just above the spline opening allowing for a 3/4 inch piece missing from the crank where it is supposed to ride on the lower crank seal, it looked some idiot dropped the powerhead on the lower crank bearing/seal housing, breaking both the housing and a piece from the crank at the same time). When running, the motor would spew intake or exhaust gas past the seal and directly out the bottom of the powerhead making for a messy test tub, massive amounts of oil/fuel. I got an excellent cheap replacement crank off Ebay, split the case, installed and viola no excess blow-by smoke. Runs 100% better. One head seemed to run hotter than the other (this motor has been punched out .020) I decided to pull the heads off (I didn't do originally 'cause to compression was acceptable, I just put in the new crank) to see if there was any restriction to water flow that might account for the difference in temp (I previously tested and cleaned the thermostats and they were fine, and there is excellent tell tale water). Upon pulling the heads I noticed that in the water passages just to left and right of the mid point of the Siamese (mid point of the bore) there is some rubber hose inserted about a 1/2 inch long forming, if you will, a dam or obstruction in the cooling jacket in the block. There is two of these obstructions on either side of the V-4. What gives? Is this some service trick to baffle the water flow and increase cooling efficiency or is this some bandaid measure to fix something else. I have looked at the seloc manual and no where does it describe this technique. Any "Old-Boy Omc Techs" heard if this?"
