Broken 2H

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Joined
Jun 14, 2010
Threads
15
Messages
124
Location
Belmont, CA
So, here I am: Cruising westbound along Hwy 412 just 15 miles east of Tulsa, Oklahoma and I get this funny burning oil smell. About 30 seconds later, it starts making nose and smoking a fair bit. Put the clutch in and coast over to the side of the road. The engine is no longer running when I stop. Pop, the hood and take a look. I don't see anything in or under the engine. Check the oil. It's just over the add line (It was full 400 miles before when I left Arkansas). Turn the key and it starts up, a bit of noise and some smoke, so I drive it 300 feet to the next road and pull off the highway.

After a little closer inspection, I feel that I don't want to be this close to the side of the highway so I drive it uphill a few more 100 feet to a large turn out. A nice fellow in a Taco drivers up and offers some phone number for some local FJ guys, but they don't answer their phone so I call on a tow truck to get me to Tulsa.

Once in Tulsa, and it's on the ground I start it up again. No smoke and not really any noise, but it is clearly running on only 5 cylinders. Since I am on a schedule, I have hired a rental car so i can get home and arrange a transport truck to pick up my FJ and deliver it to California. If all goes well, my FJ should arrive back in California in a week or so.

What I know is this: Everything was fine until it was not. EGT: 800°F, Boost: about 7PSI, RPM: 2800, Speed: 65 - 68MPH, Oil Pressure: Good, Water Temp: Below 210. No oil in the water and no water in the oil.

Any ideas on what happened? Like I said, it in only running on five cylinders, so it is either a valve stuck, a hole in the piston or possibly both. However, in that condition I'd not expect it to run at all.

Anything? Anyone?

Thanks!

Michael
 
Hmm. I'm no expert othe 2h, but it sure walks and talks like a ring land issue. Really sorry man. I know how it feels to be stranded.

This is a 12ht thread, but same results on the 2h enginesas they have the same piston design. More common when 2hs are turboed.
Example of piston ring groove failure on 12ht
 
It was rebuilt two years ago with the special alfin (sp?) pistons with the beefed up ring lands for turbo charged engines. I'd be really pissed if this was what happened.
 
Yeah, a compression / leak down will be one of the first things to do.
 
A clacking in time with the engine, not crazy loud. Bluish or white smoke. Hard to tell in the rear view mirror...
 
Injectors and Injector Pump Rebuilt 1 year ago... Precup would be bad...
 
Yeah I figured yould compression check it. Sorry for the obvious advice. I can fit a 5.5 mm bore scope through my glow plug hole and inspect my precups. Handy for tons of other stuff too. Won't help you fix the problem I'm thinking, but might help you ID it. Not only pre cups can fall in, but I've dropped valve seats before. Equally as destructive.
 
Yeah I figured yould compression check it. Sorry for the obvious advice. I can fit a 5.5 mm bore scope through my glow plug hole and inspect my precups. Handy for tons of other stuff too. Won't help you fix the problem I'm thinking, but might help you ID it. Not only pre cups can fall in, but I've dropped valve seats before. Equally as destructive.

Thanks for that gerg, I've ordered a bore scope now. They're under $10 on eBay, I thought they'd be much more expensive!

The only other thing I can add is perhaps compressor wheel failure. Unlikely, but easy to check.
 
I've just ordered a bore scope on eBay as well. Really inexpensive. A friend has one but I am doing enough that I can justify the huge expense.

Compressor wheel? Eh? What's that?
 
Ah, Turbo Compressor wheel. Yes, easy enough to check, but that is new as well. And I would have expected more than just one cylinder to fail.

Thanks!
 
Yeah, I just replaced the oil pan as well. The old one leaked like mad.
 
Well the truck is now sitting in my driveway. The results are in: I dropped not one, but TWO pre-combustion chamber caps. Cylinders 2 & 4 have busted up pistons. This really sucks! Any wisdom out there on my next repair? Should I simply replace the pistons and caps and soldier on? Is there any way to try and prevent this from happening in the future? Knurl the caps so they are tighter in the holes? Weld them in? Get a new engine? Any ideas???
 
I've dropped a pre-cup. I got a new engine because the precup destroyed #4 cyl sleeve. I would have rebuild if that wasn't the case.

I rolled my truck and was in need of a new roof anyways so 2 birds wit 1 stone
 
God dam precups.
 
Anybody have any ideas why the precups would have dropped out? In any event, I'll most likely replace the diesel with a V8 or some s*** like that. I can't have an engine that I can't rely on.
 
12HT.

It will bolt in place of your 2H, and has no precups to worry about, and starts up like a champ.

That would be the fastest/cheapest/simplest upgrade/fix you can look for, IMHO.

Dan
 
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