piston cooling jets
Cargo Master
Joined: Jun 2010
Posts: 2,771
Likes: 3
From: Louisiana
By the way the motor he is rebuilding had 3 cracked pistons. #'s 1 2 &3. Hopefully the guy doing the rebuild knows what's going on and catches if one of these are missing.
Posting Guru
Joined: Jan 2007
Posts: 2,364
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From: Gilbert Az.
Jim & fat Monty
Postmaster
Joined: Jul 2006
Posts: 4,993
Likes: 2
From: Bend, OR
I guess I'm just the lucky one! For me a jet in the pan has always resulted in a burnt piston! Ask Greg hes seen the most recent one (this feb) and believe me I'm no shadetree Ferrari, Maserati, Lamborghini, And Porsche certified master with over 25 years in the business most of it working on Manitowoc & Grove cranes, the Itialian jobs are a sideline and Porsche a life long passion, I am only giving my opinion as to what the OP asked, you can simply give yours without trying to belittle me! It's quite frankly uncalled-for!
Jim
Jim
Typical...
I disagree that a guy has to rebuild his motor because he lost a cooling jet... and now my opinion is uncalled for...
Just locktite them in there, and of course have them welded to the bracket.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Really, you called him out in the first place for stating what he thought was the best course of action.
Don't expect everyone to think the way that you do.
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Posting Guru
Joined: Dec 2004
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From: Virginia - SW (Riner)
Ok, a bit of further investigation this morning - I asked around in our shop: guys how many of you have seen a cooling jet in the pan when changing oil? Answer: oh yeah I've seen one of those out of 2 of our 8 guys. The obvious follow-up ? - when and how long? 1 said it was a couple of years ago & the other couldn't remember when he'd seen it.
Now here's the kicker - one guy is our "runner" which means lots of hwy miles with nothing in the bed other than a part or a transfer tank. The other tows a stock trailer almost daily with calves in it - prob 8-9k on the hitch.
So, either these 2 are "charmed trucks" or maybe what we're seeing ISN'T a cooling jet? Sure looks like one to me. Approx 2.5" long curved tube. That means 3 of our 8 7.3's have at LEAST 1 jet missing each. Hmmm... We may reconsider the "employees servicing their own vehicles policy" that we currently have - I'm the only "mechanic" of the bunch but I also own the Dairy so my time isn't exactly easy to come by.
Now here's the kicker - one guy is our "runner" which means lots of hwy miles with nothing in the bed other than a part or a transfer tank. The other tows a stock trailer almost daily with calves in it - prob 8-9k on the hitch.
So, either these 2 are "charmed trucks" or maybe what we're seeing ISN'T a cooling jet? Sure looks like one to me. Approx 2.5" long curved tube. That means 3 of our 8 7.3's have at LEAST 1 jet missing each. Hmmm... We may reconsider the "employees servicing their own vehicles policy" that we currently have - I'm the only "mechanic" of the bunch but I also own the Dairy so my time isn't exactly easy to come by.
Postmaster
Joined: Jul 2006
Posts: 4,993
Likes: 2
From: Bend, OR
Ok, a bit of further investigation this morning - I asked around in our shop: guys how many of you have seen a cooling jet in the pan when changing oil? Answer: oh yeah I've seen one of those out of 2 of our 8 guys. The obvious follow-up ? - when and how long? 1 said it was a couple of years ago & the other couldn't remember when he'd seen it.
Now here's the kicker - one guy is our "runner" which means lots of hwy miles with nothing in the bed other than a part or a transfer tank. The other tows a stock trailer almost daily with calves in it - prob 8-9k on the hitch.
So, either these 2 are "charmed trucks" or maybe what we're seeing ISN'T a cooling jet? Sure looks like one to me. Approx 2.5" long curved tube. That means 3 of our 8 7.3's have at LEAST 1 jet missing each. Hmmm... We may reconsider the "employees servicing their own vehicles policy" that we currently have - I'm the only "mechanic" of the bunch but I also own the Dairy so my time isn't exactly easy to come by.
Now here's the kicker - one guy is our "runner" which means lots of hwy miles with nothing in the bed other than a part or a transfer tank. The other tows a stock trailer almost daily with calves in it - prob 8-9k on the hitch.
So, either these 2 are "charmed trucks" or maybe what we're seeing ISN'T a cooling jet? Sure looks like one to me. Approx 2.5" long curved tube. That means 3 of our 8 7.3's have at LEAST 1 jet missing each. Hmmm... We may reconsider the "employees servicing their own vehicles policy" that we currently have - I'm the only "mechanic" of the bunch but I also own the Dairy so my time isn't exactly easy to come by.
That is a bent up cooling jet...
There you can see an intact cooling jet at the bottom right...
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Posting Guru
Joined: Dec 2004
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From: Virginia - SW (Riner)
Showed the picture 'round - ours from the 350 didn't get bent but otherwise it's a match. The other 2 got tossed but they guys say that looks similar to what they saw.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Here's what I think about those jets, in all honesty.
I'm far more concerned about the loss of oil pressure than I am of those pistons getting the proper cooling.
When that jet falls out it opens up a big ol' hole that will allow lube oil pressure to bleed off way faster than the designers intended.
For that reason alone, I would pull the engine immediately and repair.
I'm far more concerned about the loss of oil pressure than I am of those pistons getting the proper cooling.
When that jet falls out it opens up a big ol' hole that will allow lube oil pressure to bleed off way faster than the designers intended.
For that reason alone, I would pull the engine immediately and repair.
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Elder User
Joined: Oct 2005
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From: Reno nv
my $.02: in addition to KWIK's comment; if that piece was floating around the engine, and has marks on it, it hit something rotating or moving. Very scary thought. OTOH, my sister drove a '66 buick for 70,000 miles without an oil change. Ignorance is sometimes bliss.
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Posting Guru
Joined: Dec 2004
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From: Virginia - SW (Riner)
For us its not 1 engine but 3 based on this morning's talk. Thing is at least 2 have been this way for at least a year. Looks like after harvest is done we'll be down 3 trucks! All 3 are running ok now but long term it sounds like we'd be better off getting them straightened out.
Logistics Pro
Joined: Jun 2005
Posts: 4,243
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From: AZ
GREAT PICTURES...Are the cooling jets a press fit in? Also, is that a crack just above the piston in your picture?
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Yeah, that's a cracked block, Neal.
If it was a gasser I would say they had the timing way too advanced, but this could have been from too big of injectors, start of injection too early and too low of RPM.
Basically too much timing again stressed the main bearing.
That's my take just from looking at the picture.
It could also be the aftermath of a new window installed in the block too.
If it was a gasser I would say they had the timing way too advanced, but this could have been from too big of injectors, start of injection too early and too low of RPM.
Basically too much timing again stressed the main bearing.
That's my take just from looking at the picture.
It could also be the aftermath of a new window installed in the block too.
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Posting Guru
Joined: Dec 2004
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From: Virginia - SW (Riner)
None that I can tell - like I said earlier we have 2 trucks that have been missing jets for over a year but they don't get worked ovr real hard every day - I think if you are a heavy tow user you'd be in trouble but from our exp it seems ocassional towing & light - med use w/ a missing jet may not be as bad as it sounds. One thing I should point out: these trucks are not modded in any way except for coolant filters, 6637 intakes etc - no "HP" upping mods & no tuners. - add any of those to the eq and all bets are off....
Post Fiend
Joined: Feb 2002
Posts: 10,600
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From: Carhenge
Like Kwikk said it might affect oil pressure and if you have a good oil pressure gauge plumbed in in the right place you might pick up on it.