Can a jet cause overheating of the motor????
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Can a jet cause overheating of the motor????

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    Default Can a jet cause overheating of the motor????

    Here is one for you all, i have a 460 with a Dominator. I have noticed at idle that I have very little flow coming out the dump. at 750 RPM the water isnt enough to make a stream, just barley flows. At 3000 RPM it seems to stream out ok (5" from the bulkhead) and the motor will stay cool. At WOT (5000 RPM) the flow doesnt really increase and will go from 170 degrees to 220 PDQ and start to steam.
    i have pulled all my hoses and they are clear, Head gaskets are on properly, and headers are getting enough water, not too much.
    When i hook up to a hose and block the headers i get good flow, doesnt seem restricted.
    NOW, Tom at JBP seems to think that the wear ring may be bad, not forcing water to the motor. it isnt that i doubt his word, the man knows his shyte, i just want to know if anyone else has ever heard of this happening or experienced it themselves

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    Senior Member n8dawg's Avatar
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    Do you have a gate or ball valve to adjust the water to the motor coming off the pump?
    Im not sure on fords but my chevy has a drain screw on the block which allows me to drain the block. I would check it and see if there is and sand or debris in the block restricting the flow. Hoses are one thing but I would check the block as well.

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    ....like warm apple pie RaceFace's Avatar
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    I had a similar issue, turns out my block was full of sand from previous owners of the boat over the years. Do you have a gate valve regulating water going into the motor?
    Race

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    Quote Originally Posted by Rodbender View Post
    Here is one for you all, i have a 460 with a Dominator. I have noticed at idle that I have very little flow coming out the dump. at 750 RPM the water isnt enough to make a stream, just barley flows. At 3000 RPM it seems to stream out ok (5" from the bulkhead) and the motor will stay cool. At WOT (5000 RPM) the flow doesnt really increase and will go from 170 degrees to 220 PDQ and start to steam.
    i have pulled all my hoses and they are clear, Head gaskets are on properly, and headers are getting enough water, not too much.
    When i hook up to a hose and block the headers i get good flow, doesnt seem restricted.
    NOW, Tom at JBP seems to think that the wear ring may be bad, not forcing water to the motor. it isnt that i doubt his word, the man knows his shyte, i just want to know if anyone else has ever heard of this happening or experienced it themselves

    Help
    If your pump is worn out then yes this is very possible.

    Also could be sand in the block

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    FAT GUY IN A TPR STEALTH NO REGRET$'s Avatar
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    I Would Listen To Tom , I Spun A Wear Ring In My Pump And It Blocked Half The Feed Hole... That Hole In The The Pump Is Your Water Source If Every Thing Else Looks Good .. That's Where I Would Start.... Jmo
    "Life's tough......It's even tougher if you're stupid."

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    I have a ball valve tht is wide open. i just recently opened the freeze plugs and took out a ton of sand. The block is clear.
    Funny story, I had hydro locked and luinch a rod (hence the name). While i had the motor down i cleaned the motor and took out about a coffee can full of sand from both sides and the heads.
    Answer - the motor is clear.

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    Quote Originally Posted by NO REGRET$ View Post
    I Would Listen To Tom , I Spun A Wear Ring In My Pump And It Blocked Half The Feed Hole... That Hole In The The Pump Is Your Water Source If Every Thing Else Looks Good .. That's Where I Would Start.... Jmo
    Now that explanation makes sence to me. Dont get me wrong, Tom knows his stuff and i dont for a second doubt him, but i have a hard time getting my head around how a jet can make plenty of power, not cavitate, yet not supply enough water to the motor. i would think it would cav at hole shot or something.

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    FAT GUY IN A TPR STEALTH NO REGRET$'s Avatar
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    Quote Originally Posted by Rodbender View Post
    Now that explanation makes sence to me. Dont get me wrong, Tom knows his stuff and i dont for a second doubt him, but i have a hard time getting my head around how a jet can make plenty of power, not cavitate, yet not supply enough water to the motor. i would think it would cav at hole shot or something.
    mine was just fine never new it from performance,,, ring spun and tore up the housing blocked the feed hole just a little bit..
    could be it... or just could be a FORD.. J/K check it out..
    hope it helps.

    big D
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    i am doing 2 meetings a day trying to recover from the Ford issues. i am learning to live with it "One pass at a Time". I have learned that it works if you work it!

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by Rodbender View Post
    i am doing 2 meetings a day trying to recover from the Ford issues. i am learning to live with it "One pass at a Time". I have learned that it works if you work it!
    some of us would rather be runnin a bbf over bbc

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    It just so happens that i have ran my BBF over quite a few BBc's

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    Glendale Arizona Squirtcha?'s Avatar
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    I would guess that like "big D" said, that one little tiny hole could be partially covered due to the wear ring spinning a bit and you wouldn't notice a thing from a performance standpoint. Haven't ever had this happen, but logically it makes sense.

    Sounds like you've checked all usual suspects except the wear ring thing.

    One question..........when you connect the water hose are you hooked in before or after the valve on the pump? If you're putting water to it through the valve with the hose, then it's been troubleshot all the way through the system, other than Tom's diagnosis.
    Last edited by Squirtcha?; 10-10-2008 at 02:24 PM.

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    "Try it Now!" Tahiti Boss21's Avatar
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    this may sound stupid ,but can you hook a hose backwards up to the pump to see if there's blockage? on my 12je i can squirt water back through the pickup hose and it's wide open. a buddy of mine had a motor overheat..and it was because of the wear ring going out..he said the boat was driving fine, but when he disconnected the water line..bone dry. Just a thought from a novice
    1992 Eliminator Daytona 21'

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    Senior Member sdpm's Avatar
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    If your thrust brg is going away it will allow the impeller to move forward and block off the water supply. Has anyone worked on the pump since this started happening?

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