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| Author |
Message |
    
Don Buss
New member
Username: dabuss2000
Post Number: 1
Registered: 06-2009
| | Posted on Tuesday, June 23, 2009 - 01:54 pm: | 
|
I have a 1966 Lyman with a Gray 190 hp 327. I have replaced the thermostats, impeller, blew out the cooling lines and she still overheats. I don't think the water flow out the exhaust has as much water as in prevous years. The boat did sit for 5 years for restoration. What am I getting into if I inspect the exhaust jackets? Any other possible things I can check? |
Fredrick L Durbin
Member
Username: fldurbcharterminet
Post Number: 22
Registered: 04-2009
| | Posted on Tuesday, June 23, 2009 - 03:27 pm: |
|
check your intake hose to the water pump if any of the vanes from the impeller broke off they could be blocking the intake of the pump itself. I had this happen many years ago and found this to be the problem.
Fred Durbin |
Cal Martell
Advanced Member
Username: cal
Post Number: 171
Registered: 02-2004
| | Posted on Tuesday, June 23, 2009 - 05:14 pm: |
|
There are four different pumps that Gray used on these engines the Jabsco is dual impeller with intrgral blades and cannot be repaired, must be replaced, also the Sherwood (part # 77585). The two other Sherwoods 75954 and 77532 have replaceable blades, Neoprene.  |
Don Buss
Member
Username: dabuss2000
Post Number: 4
Registered: 06-2009
| | Posted on Wednesday, July 15, 2009 - 01:28 pm: |
|
My problem ended up in the heads them self. Improper water flow caused a head gasket to blow. i'm now in the process of having the heads redone. |
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