SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: 93_ultra on May 11, 2015, 10:00:47 AM
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was cruising up the river to the avi on Saturday when my motor shut off. right before it shut off my temp and oil pressure were perfect. it just shut off. no knock or pop. thought I ran out of fuel. popped the hatch to find steam coming from breathers and carb. pulled dipstick and my oil level was good, and started to steam out the stick hole. tried to start it to get to a beach but she would not turn over. where should I start? motor was rebuilt a year ago and has 22 hours on it.
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was cruising up the river to the avi on Saturday when my motor shut off. right before it shut off my temp and oil pressure were perfect. it just shut off. no knock or pop. thought I ran out of fuel. popped the hatch to find steam coming from breathers and carb. pulled dipstick and my oil level was good, and started to steam out the stick hole. tried to start it to get to a beach but she would not turn over. where should I start? motor was rebuilt a year ago and has 22 hours on it.
Ouch! Could vapor lock be a possibility?
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Ouch! Could vapor lock be a possibility?
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I'm going to pull the plugs and check for water. what would cause vapor lock?
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What were the volts reading before shut off? Did it crank at all when you tried again?
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That happened on my uncle's boat. The jet seized. He was sure he lost his motor when it happened. See if you can disconnect the driveline, remove the plugs, and carefully spin the motor over with hand tools. Or at least look at your impeller through the intake and see if your impeller looks normal. That's where I would start. Best of luck to you!
SCJB iPhone
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What were the volts reading before shut off? Did it crank at all when you tried again?
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hey wes give me a call.
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That happened on my uncle's boat. The jet seized. He was sure he lost his motor when it happened. See if you can disconnect the driveline, remove the plugs, and carefully spin the motor over with hand tools. Or at least look at your impeller through the intake and see if your impeller looks normal. That's where I would start. Best of luck to you!
SCJB iPhone
I'll check that out. thanks!
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Yup sounds a lot like a pump failure.
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Even though the temp gauge indicated normal temperature, did the engine feel excessively hot when you opened the hatch?
You didn't mention any milkshaked oil when you pulled the dipstick, so far, so good.
Start with the basics, verify that you have fuel, spark, and compression.
I would also check for flow obstructions inside the engine. Back flushing might dislodge debris.
Good luck,
Joe
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so I found part of my problem. all my other plugs look good except for this one. I will pull the valve cover off later today and see what happened.
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so I found part of my problem. all my other plugs look good except for this one. I will pull the valve cover off later today and see what happened.
Going to need to pull a bit more than a valve cover.
I'm thinking head.
GT
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pulled the valve cover. found some valve seal pieces up on the head. bo appearant valve damage from the top side.
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pulled the valve cover. found some valve seal pieces up on the head. bo appearant valve damage from the top side.
Pull the head.
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Pull the head.
well there it is!
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Ouch, that's not good
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That's not good
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well there it is!
That sucks buddy, sorry.
Let me know what you need. Might be able to do it on the cheap.
GY
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Wow! What causes that and what can be done to prevent it?
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Wow! What causes that and what can be done to prevent it?
Wallet got too thick. The cash sensor is overly sensitive. Lol
Either a dropped valve caused by a retainer failure, a seized stem/guide, a rod bearing failure, valve train geometry issue, cold water (reversion).
The list is both long and distinguished.
GT
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Wallet got too thick. The cash sensor is overly sensitive. Lol
Either a dropped valve caused by a retainer failure, a seized stem/guide, a rod bearing failure, valve train geometry issue, cold water (reversion).
The list is both long and distinguished.
GT
Lol. Did you just pull a top gun line? Ya, that is f#cked up. Mine did the same thing..........running fantastic and then it was like you cut the fuel off. Smashed spark plug, f#cked up piston. Super messed up.
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Lol. Did you just pull a top gun line? Ya, that is f#cked up. Mine did the same thing..........running fantastic and then it was like you cut the fuel off. Smashed spark plug, f#cked up piston. Super messed up.
Holy sh!t top gun is on spike channel right now.
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Hells ya!
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Hells ya!
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That sucks buddy, sorry.
Let me know what you need. Might be able to do it on the cheap.
GY
I just need to get it fixed asap or replaced.
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Lol. Did you just pull a top gun line? Ya, that is f#cked up. Mine did the same thing..........running fantastic and then it was like you cut the fuel off. Smashed spark plug, f#cked up piston. Super messed up.
yep. sucks. now it's river season. gotta fix it quicjly!
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well there it is!
Heavy rubbing compound for that bad boy. Dam the luck..... wrong time of the year for that.
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Heavy rubbing compound for that bad boy. Dam the luck..... wrong time of the year for that.
lol
nice looking boat btw. saw you on the 40 on the way home
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How does it hit the spark plug? Plugs to long?
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How does it hit the spark plug? Plugs to long?
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Flailing parts did the spark plug damage. Not the other way around.
GT
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Flailing parts did the spark plug damage. Not the other way around.
GT
He's lucky those flailing parts didn't make it back up the intake and down into other cylinders. I've seen that more times than I can count...
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Sucks man. Been there. I got a really cool paper weight out of it. You'll be mashin' the gas in no time! There is plenty of time to get it handled.
SCJB iPhone
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it really cant be abused...theres 30 minute time delay between when you can give karma....I will raise that time limit if I have to.
thanks. I just have to figure out what direction I want to go. rebuild? replacement motor?
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thanks. I just have to figure out what direction I want to go. rebuild? replacement motor?
Did the cylinder wall get damaged?
What pistons? I have a few sets of "7". Hahaha
I have some single heads too.
What casing numbers are you playing with? What bore size?
Let's glue this vase back together. Lol.
Gt
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Did the cylinder wall get damaged?
What pistons? I have a few sets of "7". Hahaha
I have some single heads too.
What casing numbers are you playing with? What bore size?
Let's glue this vase back together. Lol.
Gt
piston was a speed pro hypertectic dome 110 . .40 over.
part number SLP-WH426CP40
088 heads
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piston was a speed pro hypertectic dome 110 . .40 over.
part number SLP-WH426CP40
088 heads
I will talk to the machinist man someone tomorrow. .
088's? Is it F'ed over? Look fixable? How about the block?
The piston is easy. You can buy singles of Speed Pros.
The ones I have I will have to look at. I think they are .060" over.
GT
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I will talk to the machinist man someone tomorrow. .
088's? Is it F'ed over? Look fixable? How about the block?
The piston is easy. You can buy singles of Speed Pros.
The ones I have I will have to look at. I think they are .060" over.
GT
the head looks unharmed. same as the cylinder from what I can see. but I need to get the piston out to see the whole cylinder.
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the head looks unharmed. same as the cylinder from what I can see. but I need to get the piston out to see the whole cylinder.
Andale' mochacho.
Lol
GT
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Sorry to see your troubles! Had a thought since the valves got smacked pretty hard... maybe think about pressure testing that head to be sure the exhaust guide isn't disturbed or damaged. They run through the water passage in the head so if they move or crack they can leak coolant.
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Sorry to see your troubles! Had a thought since the valves got smacked pretty hard... maybe think about pressure testing that head to be sure the exhaust guide isn't disturbed or damaged. They run through the water passage in the head so if they move or crack they can leak coolant.
cool thanks! and that's an intake valve that sucked