"Bought the Larson from my nei
"Bought the Larson from my neighbor several years ago and thought it appropriate to change the impeller. Removed the water pump housing and sure enough, the impeller was shot. Installed a new O ring and impeller and unknowingly over torqued the 4 brass bolts that hold the house to the pulley. First time out after this repair, the heads of the 4 brass bolts blew off and the housing and impeller came off of the end of the shaft. Engine got to 230 degrees before we realized we had a problem. Got towed in, came home and pulled the 4 studs from the pulley, installed the impeller again, housing and 4 new bolts. Started the motor with water coming through the muff and heated the engine to its normal running temperature of 175 degrees. Everything looked great until I nfound a very small amount of water being shot from the pulley area. Installed a newe O ring thinking the previous new one may have a small cut and went through the same process and still had a small leak from the same place. Wondering - 1) could the housing have cracked when the 4 bolt heads blew off and the housing came off of the end of the drive shaft or 2) are there seals or gaskets behind the pulley that may have been damaged at the 230 degree temperature? Another strange symptom - as soon as it overheated and we shut it down, I checked the oil dipstick and it registered no oil (holy #!$^). Got home with the boat and checked the oil and it was at the full mark. Then in the subsequent driveway tests discussed above, at 175 degrees, rechecked the oil dipstick again and had the same result - no oil on the stick. Throughout all of this, the oil pressure guage has registered same presssure as before the overheating condition? There is no water in the oil. HELP PLS!!!"
"Bought the Larson from my neighbor several years ago and thought it appropriate to change the impeller. Removed the water pump housing and sure enough, the impeller was shot. Installed a new O ring and impeller and unknowingly over torqued the 4 brass bolts that hold the house to the pulley. First time out after this repair, the heads of the 4 brass bolts blew off and the housing and impeller came off of the end of the shaft. Engine got to 230 degrees before we realized we had a problem. Got towed in, came home and pulled the 4 studs from the pulley, installed the impeller again, housing and 4 new bolts. Started the motor with water coming through the muff and heated the engine to its normal running temperature of 175 degrees. Everything looked great until I nfound a very small amount of water being shot from the pulley area. Installed a newe O ring thinking the previous new one may have a small cut and went through the same process and still had a small leak from the same place. Wondering - 1) could the housing have cracked when the 4 bolt heads blew off and the housing came off of the end of the drive shaft or 2) are there seals or gaskets behind the pulley that may have been damaged at the 230 degree temperature? Another strange symptom - as soon as it overheated and we shut it down, I checked the oil dipstick and it registered no oil (holy #!$^). Got home with the boat and checked the oil and it was at the full mark. Then in the subsequent driveway tests discussed above, at 175 degrees, rechecked the oil dipstick again and had the same result - no oil on the stick. Throughout all of this, the oil pressure guage has registered same presssure as before the overheating condition? There is no water in the oil. HELP PLS!!!"