Cast away nick
New Member
- Aug 27, 2018
- 16
- Boat Info
- 1990 searay 230 2001 marine power 5.7 efi closed loop fresh water cooled.
- Engines
- 2001 marine power 5.7 efi fresh water cooled alpha 1 gen 1
Help be my head hurts. I have a 1990 Sea Ray 230 with a motor ( purchaced new and installed by a previous owner) 2001 marine power 5.7 efi closed loop fresh water cooled. I bought the boat k knowing it had a running issue. I took it to the lake the day I bought it to see what it was doing. It got hot, spit sputtered died. The next day I put it on muffs to see what was going on with it and it started fine ran fine for about 15 minutes until I fixed the idle air issue and the idle dropped down started to get warm spitting and sputtering etc. Starboard risers much hotter than port side but appeared to have good flow. Pulled lowerer unit, complete cooling system manifolds, risers all that. Only thing I found was the starboard matter shutter was half gone, same elbow looked melted at the riser joint. Manifolds looked very nice but sent them and the risers out to get hot blasted. Only ran in fresh water and has from what I could figure less than 100 hrs on it. The boat only has 257 hrs total. Obvious cultprit would be raw water pump but that looked almost new (replaced anyways) heat exchanger appeared to be good with no clogging, thermostat looked old so I have a new one. Haven't put I back together because I haven't located the other half of the water shutter and I haven't found a smoking gun as to why it got hot. Compression test showed 175# on all but 2 cyliders and the oil is fine and no back pressure in overflow tank. I have all but ruled out head gasket being the issue from the symptoms on the water and on the muffs. One thing I did notice was it has a blocked gasket between the manifolds and the risers and the coolant in there was brown ibrown ish while the rest of the coolant was bright green and new looking. Pulled and inspected the circulation pump and it looked new.