Mater's motor knock revealed

[Dsl_Dog_Treat]

Well, since I was in process of a really crappy week, I decided to take a gamble and do a little more research on Mater before I pulled the motor.
I figured that I'd start with #3 since it showed the lowest compression numbers.
Glad I did because as I was trying to remove the IP line, the entire injector was spinning around. Dang thing was loose in the hole and never showed any symptoms of such.
I got it out, threw it on the tester and found it ******* like a cow on a flat rock. As you can see in the video, the pintle is stuck wide open.

Cause of death????? You can see in the picture of the 2 injector tips that the one on the right has seen some extreme heat......Caused by the injector being loose and seized the pintle.

Pulled a few more injectors out, tested them all popping off at 1950 psi.

Grabbed one of my cores, gutted it, re shimmed it to match and TADA!!!!!
No more hammering noise and running much smoother.

Took him for a spin around the block and am happily satisfied that I resolved the problem fearing the worst.

As said in the movie Evan Almighty.........Do the dance!

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[dyoung14]

glad to here you didnt have to pull your motor out

 

[IDIeselman]

Good news, 1 bad injector = 1 happy man Who would have guessed?

 

[geonc]

Nice find Ron

 

[subway]

wow that thing had some nice flow to it, should have just increased the rest and the air to match

 

[tractorman86]

we should do that to all of our injectors!

 

[icanfixall]

Would have been really tuff on you to pull the motor and then find the injector problem... Glad it worked out for the best...

 

[typ4]

It looks like that injector drank a lot of beer. Good find.

 

[Agnem]

Cool!

 

[seawalkersee]

I wish I still had access to one of those testers. I want to have mine checked as I too have a knock. BUT, mine is smoking white so I may be in need of a pump soon.

SWS

 

[LCAM-01XA]

SWS, smoking white can also be result of too much fuel at the wrong time, when I had my #5 injector loosen up in the head like Ron's did I lost compression and the fuel wasn't burning off completely, and I got lost of white smoke - tightened it down, compression went up, fuel is burning good again, I've put thousads of miles on the engine since and I still runs tip-top. So do not exclude injectors as a culprit to your issues as well, and you may wanna sweet talk some fellow OB member who's near you and has a tester to pop-test them injectors for ya...

 

[argve]

That's good news there Ron.... Glad it's only that and not a rod or something...

 

[Dsl_Dog_Treat]

wow that thing had some nice flow to it, should have just increased the rest and the air to match

It's just a plow truck!

Would have been really tuff on you to pull the motor and then find the injector problem... Glad it worked out for the best...

Tell me about it. I thought that same thing last night when I was shutting the hood. I'm one happy dog catcher now!

Oh yeah, I'm sure you would have heard me then.
Plus the savings of not having to replace the gaskets.

It looks like that injector drank a lot of beer. Good find.

Yeah bladder was full.

I'm 100% positive that the injector had been loose for awhile judging by the amount of heat that the tip had seen and the pintle is fused into the tip.

It'll make a nice addition to the Moostradamus Museum of Mystery.

So kiddies, make sure they're tight in their sockets.

His rest is over, now it's time to put him back to work, haulin firewood.

 

[HammerDown]

How does a injector become loose in the hole, when the hard line is bolted to it....?

 

[Dsl_Dog_Treat]

How does a injector become loose in the hole, when the hard line is bolted to it....?

P.O. may have not seated it properly.

I can say it was a PITA to get the line nut apart from the injector though.
I thought at one point I was going to end up twisting the line and junking it out. It was tight to say the least.