Broke another water pump . This one is wierd ?

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Johnny
Mar 20, 2008
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Santa Ana , Ca.
OK .... who has seen one like this .... usualy I spin the gear off the shaft and why I spot weld the gear now . This one was wierd . WTF is my only answer . Is this from instant throttle on a cold motor . Is it from high rpm . Is this from a wicked tune and instant rpm ... Your guess is as good as mine .

The pump still spun free . Doesnt make sense . Anybody else seen them break like this ?

The one thing that was a blessing was the cam gear was ok . Thank God . Or I would be pulling the motor .

The last pic is the nice clearance in the block from previous gear spinning off the shaft and grinding the block . Deep into the freeze plug galley .

View attachment 18284View attachment 18285View attachment 18286View attachment 18287View attachment 18288
 
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Johnny
Mar 20, 2008
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jneal said:
What lead you to pulling the water pump off?
Click to expand...

Was easy to zone in on where the noise was coming from . The good ol stethescope helps to pinpoint it . Great tool .

View attachment 18299

My original guess was the spot welds broke and the gear was off again hitting the block . I thought the noise was the spot welds hitting the block and making the gear bounce and clank . The broken teeth was not what I was expecting .

The teeth werent in the top of the timing cover and I am going to drain the oil and run it through a sifter screen and see what I get back out of the motor .

Im saying prayers to the dmax gods right now that the cam gear isnt damaged . Dont see how it wasnt . Rolled the motor through and inspected cam gear closely and couldnt even see any marks on any teeth . My concern is the crank gear and CP3 gear also . Did the broken teeth stay in cam gear and get rolled through somewhere else . ??

I put a new pump in and buttoned it up . Running smooth and quiet . Not to happy about it to say the least . Would like to just pull the motor and tear it down . Replace the cam gear and inspect the others .

There was only really one choice . Run it . See what happens .

These damn water pumps have been a pain the last few years . The only real plus I saw was ..... my spot welds held up and the gear didnt come off this time . LOL
 
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Johnny
Mar 20, 2008
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It started as a clicking sound .... I think it broke 1 tooth originally .

Drove it home from work 10 miles and it was a clanking sound and loud . I have a video and sent it to my mail . The damn sound isnt on it though . Loud as hell and at first sounded like either a rod or wrist pin in a piston or something . I figured I had really hurt something . Once I got the stethescope and lined up on the noise , I was a little more relieved .

The water pump again ...... wtf . Broken teeth ..... you gotta be kidding me .

This is a new one to me ??
 
MACKIN

MACKIN

Smell My Finger...
Aug 14, 2006
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Connecticut
Unless the pump for some reason the pump hung up in the housing and temporarily froze I'd say you had a defective gear with some hairline cracks and they snapped off.

What the hell else could it be? :confused: Did you drop it at anytime? :confused:
 
RKTMech

RKTMech

Idiot with a wrench
Aug 18, 2008
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The Norco's
Wow, maybe just a tight spot in that area of the casting that finally lost its tooof! How long was that one on Jonny? Also seems hit and miss on the welded ones staying welded...
 
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Johnny
Mar 20, 2008
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Santa Ana , Ca.
I looked closely at the impeller . Doesnt look like it hung up on anything . The pump did feel a little dry inside the bearing . Spun freely but not like the new one .

Just one of those wierd breaks and why I posted it .

Could have been tragic and the motor could be coming out because of something like this . Could have been a bad one and took out the cam gear , cp3 gear and crank gear .

I do have one idea ..... this happend right after dry drifting the truck smoking the tires down the street . Same place as the pic below , except full drift . Was showing off for the tow boys right before parking my truck the night before . Could it be from backlash hard full throttle then lifting on the pedal . This is the only thing that I think might have happend .

Who knows ?? sure made me a little hesitant to push on the go pedal . :D
 
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Johnny
Mar 20, 2008
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Santa Ana , Ca.
I'll stick with the good ol stock water pump . Not to fond of electric anything .

Especially a electric water pump . Not my cup of tea . Not for my application at least . Maybe on a race truck .

Funny after something like this happens . A little paranoid I am still .

Will take a while for me to be confident the cam gear is ok and all is well .

Every noise I hear .... radio down .... listening .... listening .... :eek:

Give me a week or 2 ..... then I am sure I will be back to my old self . :driving: :roflmao:
 
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Johnny
Mar 20, 2008
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Santa Ana , Ca.
My thoughts exactly Pat . Has me a little concerned .

She is back together and running . No noise and seems fine .

The pump wasnt siezed and spun freely . Really wierd ?

Damn gear didnt come off though like usual . :roflmao:
 
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Johnny
Mar 20, 2008
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Santa Ana , Ca.
This gear breaking teeth has been bugging me . If the pump was just installed I would be inclined to believe a gear flaw . Just doesnt make sense .

Wierd things is .... this pump had been in the truck for over 8 months . :screwy:

You would think if the gear had a flaw it would have broke long ago .
 
T

turbo_bu

Member
Mar 27, 2007
199
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Central IL
If you look close enough at the brokern gear surface you should see some indications of fatigue. If that is the case, depending on how big and where it was located at would dictate how long it took to crack (not immediately, but 8 months in your case).

As you mentioned, the other concern is for the cam and CP3 pump gears. Depending on the rotation, the only hope is that the broken teeth fell "out" of the way and did not go through the remaining gears. If so, yes, they are also probably damaged and will eventually fail too. Hopefully, since this is a very small failure (only 2 teeth), they dropped out and did not do any more collateral damage.
 
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