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How Does This Happen

tacker

By tacker,
in Engines & Forced Induction

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tacker Mentor

tacker

Posted
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Posted (edited)

yer would you believe i was just sitting at the control light waiting for it to go green to start track session and bang! Engine was only idling thank F#$5.

Radiator got a bit of a touch up from the fan and engine got a bit hot but not to bad would hate to think what would have happened at 8000 rpm?

I put it in and before you say it i have been working on engines for the last 22 years and this is a simple task. Try putting an oil pump or an oil cooling nozzle into a Cummins KTA 50G3 which are both the definition of bloody near impossible.

The pump had already done some track time with no problem then bang

Edited by tacker
STATUS Grand Master

STATUS

Posted
Posted (edited)

Its either an indian cheapy with casting issues (look for flaws, i cant see any in the pic though) or the belts were to tight. I have seen this happen to those copy SR20 sumps getting around small tap on a ripple strip and they literally fall off.

Edited by URAS
tacker Mentor

tacker

Posted
  • Author
Posted (edited)

yer big old smelly, nasty deisels. I am sure belt was not to tight still i guess that would be a reason for this happening but how tight must it have been to break that amount of cast alloy. And would that be possible with 1 little tensioning bolt.

Pump was brand new when i put in on and i put the few kms on it without any issue, so it was never removed from any other engine. Thinking a N1 will now be put on as getting sick of removing cam belt etc to put pump in place only changed the last one as i put new cam belt on and thought i better do the right thing

Edited by tacker
Fanta R33GTR Contributor

Fanta R33GTR

Posted
Posted

The water pump in my GTR did exactly the same thing. The belt was just a little too tight and after a few weeks when I let her rip, it snapped and the pump was held on by only a small piece of metal.

Like other have said,

If it's not that then it's just a cheap pump perhaps with bad manufactering...

taynewguy Community Regular

taynewguy

Posted
Posted

Sounds like you got away with it ok though.

This happened to me a while back in my r33 - threw the fan into the radiator at about 5000rpm.

The fan had a few chunks missing from the blades and the radiator was cactus!

We put it down to a fault/hairline crack in the water pump itself, as the belts were at correct tension.

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