Found the problem with my cummins

[matt]

Now to check the head and the block for flatness.  Hopefully tonights project if it is not raining.

[Harrison]

How many miles?

You said it was running on 4 cylinders according to the injector line diagnosis method?

Did it get progressively worse or did it just run like shit one day?

[matt]

Yeah 4 on the injector line diagnosis. 

Just running along and then like ....  and that's all she wrote.

[matt]

Doesn't look good

[matt]

And piston # 6

[etk300ex]

No good

[Ryan]

Ouch, run it 

[rejeep]

gasket and sell

[Wingman]

Has another billionty miles in it!

[matt]

Bad time of year to have this happen.  Looks like no camping or wheeling trips for a while.

The scratches aren't that bad...  going to see if the rings are still sealed and it the bores are round.  If they are, I may re ring it till to get me by till winter or just run it till I can pull it to rebuild.

[Harrison]

Water in the cylinders? High EGTs? How many miles?

[mr.mindless]

Ouch.

I wonder if the bad HG gave it a hot spot. Looks like that bad part lines up with where the gasket was holed?

If the early and late 12v pistons match I have good stock pistons from my first motor. I think the bowls are the same but it would deserve a minute of research.

Mild hone in that hole and fresh rings on a good piston could probably get her happy again for a decent amount of time with minimal downtime and expense.


Tapatalking in traffic

[matt]

Any of you guys have a service manual for a cummins?  Looked on line and found nothing. 

Specifically wear limits and max out of round for cylinders.  Got a bore indictor and cylinders are .002" out of round.  Want to double check size of bores before I just hone and rering that one cylinder.

[matt]

So many dollars later.

[matt]

And finally in and running.





My daughter picked the paint.  I was worried it was going to be pink or purple. lol

Runs great.  Smoother running, more power, and quieter.  New injectors are great.  Marine 370's....