SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: 72glastron on August 07, 2013, 10:56:07 AM
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A little history, the boat sat in my dad's back yard for 25+ years.
It popped a freeze plug one season, and sat parked after that.
15 or so years ago the freeze plug got replaced, then the steering and forward/reverse cables were in need of replacement.
He offered the boat to me on vacation one year and said I could tow it home to SoCal (from MN).
A couple years ago I talked my dad into getting it running again.
We replaced the trailer tires/bearings etc. and towed it to their lake home in northern MN.
Sadly my dad passed away before we could get it running. :(
I'm back in MN on vacation, and we decided to get it running again.
I worked on it a little, but tools/time were limited.
Replaced the starter, yanked all the crusty/corroded wiring, installed a loaner carb, and rigged up a temporary set-up to try and crank/start it up.
I primed the oil pump, and cranked it with the result of no spark.
Replaced the coil, checked again, no spark.
Replaced the points, and nice fat blue spark.
Fed the carb a little fuel, and it fired right up, but promptly dumped the oil from the filter.
Checked the filter and it was loose, so tightened it, refilled the oil, with the same result it dumped the oil again.
Removed the filter, gasket was blown, replaced with another new filter.
Refilled the oil, and tried again with the same result.
Not knowing anything about Chevy engines, I'm guessing here?
Probably the relief valve in the oil pump is stuck?
Huge bummer, as the engine has to get pulled to fix this?
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Is the oil pressure gauge working? Does the oil filter gasket have enough surface area to properly seal?
I'd think it would take a wild amount of oil pressure to blow a oil filter gasket out.
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I removed all the wiring it was in VERY poor shape.
Doubt a 41yr old electric pressure gauge would have been much use?
Plan is to rewire w/ new gauges. Wanted to see if it would run.
It seems to run well enough to proceed.
Engine fairly low hours/usage, just sat for loooong time.
My thinking is the relief valve in the pump is stuck and the filter can't take the pressure.
But, like I asked don't have any Chevy knowledge.
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I removed all the wiring it was in VERY poor shape.
Doubt a 41yr old electric pressure gauge would have been much use?
Plan is to rewire w/ new gauges. Wanted to see if it would run.
It seems to run well enough to proceed.
Engine fairly low hours/usage, just sat for loooong time.
My thinking is the relief valve in the pump is stuck and the filter can't take the pressure.
But, like I asked don't have any Chevy knowledge.
Did you drain and replace oil,, anything interesting come out in the drained oil? What filter are you using, it should have a built in bypass, particularly if someone plugged the bypass in the oil filter adapter (I do that on most engines that I build, since it's kind of a wimpy , low pressure deal anyway). If you don't have one, think about running the oil pump with a drill and oil priming tool, but you will need to know how to get the distributor dropped back in properly, and will need to reset timing once you get it running. PM if I can answer any specific questions.
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Oil and filter was clean no weird stuff.
Engine was primed via drill fixture.
1st new filter was AC pf35?
2nd new filter was a Fram don't remember the #.
(it was Sun. and only local fleet store was open)
walmart open as well, but they only stock fram as well.
small town and selection is pretty limited.
Both filters the seal blew and a LOT of oil dumped.
Refilled it w/ new oil both times and it came out clean.
Only ran the engine for a few seconds each time.
Interesting you mention using a filter w/ built in bypass.
Have a part#?
I have no info on this engine other than it's a 454 built for use in this boat.
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Oil and filter was clean no weird stuff.
Engine was primed via drill fixture.
1st new filter was AC pf35?
2nd new filter was a Fram don't remember the #.
(it was Sun. and only local fleet store was open)
walmart open as well, but they only stock fram as well.
small town and selection is pretty limited.
Both filters the seal blew and a LOT of oil dumped.
Refilled it w/ new oil both times and it came out clean.
Only ran the engine for a few seconds each time.
Interesting you mention using a filter w/ built in bypass.
Have a part#?
I have no info on this engine other than it's a 454 built for use in this boat.
You aren't going to fix that type of issue with a different oil filter. What kind of pressure did the gauge show, both when you primed it and when you fired it up?
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I removed all the wiring it was in VERY bad shape. Frayed/cracked/corroded.
The oil sender wiring was shot.
Wasn't planning on working on it or I would have been more prepared.
The oil pressure is likely very high since it blew 2 filter gaskets out.
The only wiring right now is a coil wire w/ switch, and a starter solenoid pigtail for use w/ remote start switch.
When running there was no lifter/valetrain noise so oil was up there.
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Install a mechanical oil pressure gauge, go from there :screwy:
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The oil pressure is likely very high since it blew 2 filter gaskets out.
I understand that, but without a gauge you really don't know how high it is, not the best way to run any engine.
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Update...
Last year local marine outfit replaced the oil pump.
I pulled the intake manifold and had it cleaned etc. due to a mouse house inside.
Rebuilt the carburetor, installed new gauges, fixed all wiring, upgraded to a 10Si Delco alternator, new v-belt, new fuel pump, and all new cooling hoses.
Got it running(yay!) first time in probably 30yrs.
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