Mikey N.C.
Seaman
- Joined
- Feb 14, 2020
- Messages
- 63
Customers boat , shop I'm working at install jasper long block 2015. Customer said boat wouldn't start late last yr. I pulled spark plugs all good except #4 was rusty. Oil was mixed , sucked out about a bucket full , to get near safe mark on dip stick. Started compression test , #4 was pushing rusty water out. Pulled starboard exhaust manifold #4 had water running out. Looked at exhaust valves all three had rust ( not bad) on valve stems about 1" up
pressure tested exhaust manifold 17-19 psi with air no leak down. Used cylinder leak down tester on #4 no leak down. Blocked off thermo. housing for both exhaust hoses ,attached a hose to sea water pump hose connection at thermo. housing that eliminates exhaust and sea water pump. Filled block with water thru , sea pump connection at thermo. housing . Hooked up radiator pressure tester to hose and pumped up to 17-19 psi no leak down after 30 mins . question does that intake have exhaust crossover in the center near carb. or is it a water crossover ? Did they ever use water crossover in the center of intake manifolds, if so is it possible that it's a mixed matched intake to motor. I don't think that's the situation but could be. I'm at a loss as why is only #4 getting water, other thank cracked cylinder wall or head gasket , but should have found with block pressure test. Any suggestions will be appreciated. THANKS
pressure tested exhaust manifold 17-19 psi with air no leak down. Used cylinder leak down tester on #4 no leak down. Blocked off thermo. housing for both exhaust hoses ,attached a hose to sea water pump hose connection at thermo. housing that eliminates exhaust and sea water pump. Filled block with water thru , sea pump connection at thermo. housing . Hooked up radiator pressure tester to hose and pumped up to 17-19 psi no leak down after 30 mins . question does that intake have exhaust crossover in the center near carb. or is it a water crossover ? Did they ever use water crossover in the center of intake manifolds, if so is it possible that it's a mixed matched intake to motor. I don't think that's the situation but could be. I'm at a loss as why is only #4 getting water, other thank cracked cylinder wall or head gasket , but should have found with block pressure test. Any suggestions will be appreciated. THANKS