2000 Trooper Oil Usage and Piston Rings

[pr99trooper]

Originally Posted by rodeo02

That's the first I've heard of that! It's a wonder you didn't have low compression & excessive blowby (crank case pressure) with the over-bore condition?? Plus i'm not sure why they didn't just press new (tighter) sleeves into the block?! A whole new engine was a better deal anyhoo. If the cylinders were overbored, you would have oil consumption from day one . Good to hear isuzu took care of it for you.

G/luck
Joel

I'm not an expert on the matter, but I've been told that new rings have a little bit of "spring" in them that can initially compensate for the oversized cylinder. What happens over time with heat cool cycles is that some of the "spring" gets taken out of the rings and it's ability to compensate for this diminishes. I had an oil consumption problem that started at 15K and progressively worsened to 1 quart/500 miles at 50K.
Of the six cylinders, only one was in spec, which was an "A" sized piston and rings matched to a cylinder that was in the "A" spec range. The five others had "C" sized pistons and rings in a cylinder that was well beyond the "C" spec. In fact, they were at the very limit of the overbore size, meaning that they could not be machined again. Why this was done, only Isuzu can answer. I know that my new block has all "B" sized pistons and hopfully in "B" spec cylinders. With respect to pressing in new sleeves, this option was not disscussed. Isuzu did not require the block to be sent back to be "recycled", rather they were told to dispose of it locally.

Like I said earlier, knowledge is power, and I believe that was the underlining reason why I got the short block replaced and not just a band-aid repair.

Patrick

[LEM]

I did the cylinder soak and it seemed to help. The last I checked, I used about 1 quart at 1,000 miles. I think I'll try that CD2 detergent as well.

thanks.

[rodeo02]

Looks like a step in the right direction! A 50% reduction in oil consumption. Time will tell if it gets better or worse. CD2 is worth a try, as is another soak if you could stand it .

G/luck
Joel

[wb4lbg]

OK. I'm just a visitor from the Rodeo Forum. There was a link to this thread over there. I, too, have an oil consumption problem -- about a quart per 500-600 miles at highway speeds and about half that around town.

The cylinder soak sounds intriguing but it's starting to get kind of cold here so I might give it a try come spring. In the meantime, the CD2 option sounds like it might be worth trying.

Question -- After putting the CD2 in, what then? Drive a little and change the oil? Drive a lot and change the oil? No oil change required?

Thanks for any input.

[rodeo02]

Originally Posted by wb4lbg

...Question -- After putting the CD2 in, what then? Drive a little and change the oil? Drive a lot and change the oil? No oil change required?

Thanks for any input.

Follow the instructions on the bottle of CD2. You don't want to vary from the manufacturer specific instructions on oil additives as some can be very harsh.

G/luck
Joel

[Superskeet]

Originally Posted by wb4lbg

OK. I'm just a visitor from the Rodeo Forum. There was a link to this thread over there. I, too, have an oil consumption problem -- about a quart per 500-600 miles at highway speeds and about half that around town.

The cylinder soak sounds intriguing but it's starting to get kind of cold here so I might give it a try come spring. In the meantime, the CD2 option sounds like it might be worth trying.

Question -- After putting the CD2 in, what then? Drive a little and change the oil? Drive a lot and change the oil? No oil change required?

Thanks for any input.

The directions say add every 2000 miles. I ran the first bottle on a fresh oil change and then changed the oil at 2000 miles (The oil is so dirty at that point you will want to change the oil). Ran another bottle and went 3000 miles before changing the oil again. At this point my consumption had improved to using 2 qts during the 3000 mile period(added one). Did not use CD2 during the next oil change and used 1 qt in a 3000 mile period. Even without the CD2 the oil got plenty dirty I assume because the sludge that was loosened by the CD2 was still breaking up. I'm on my second oil change now without CD2 and oil consumption is still minimal.

[wb4lbg]

SWEET!

I'm due to change my oil this weekend. I'll get me some CD2 and add it to the fresh oil and change her out at 2K.

Thanks!

[Superskeet]

Originally Posted by wb4lbg

SWEET!

I'm due to change my oil this weekend. I'll get me some CD2 and add it to the fresh oil and change her out at 2K.

Thanks!

Please post your results! Thanks

[mlingk]

I've done two treatments with the CD2, 2-3K miles each, and It hasn't helped my truck. Still burns 1qt/700-800 miles. I've also tried two full A-RX cycles and a run of LC, but normal dosage. I've run seafoam in the oil for 200 miles. Running a 20W-50 M1 also didn't help. Was talking with about this yesterday and came to a couple of conclusions. If heavier weight oil didn't slow consumption, then its not likely a seal problem. Probably still burning off slowly just like lighter weight oils. We agreed that a cylinder soak is my best/last hope, since I've tried almost everything else. In regards to the soak, it seems that you couldn't do all at the same time, since some of the pistons will be at the high level, and at an angle. Any fluids poured in would leak down into the exhaust system. Wouldn't you need to measure with a plastic/wood stick and soak just the pistons that are halfway or lower in its travel? I'm going to try a LC soak next week half one day, other half the next day. I'll report back how it goes.

[Superskeet]

Originally Posted by mlingk

I've done two treatments with the CD2, 2-3K miles each, and It hasn't helped my truck. Still burns 1qt/700-800 miles. I've also tried two full A-RX cycles and a run of LC, but normal dosage. I've run seafoam in the oil for 200 miles. Running a 20W-50 M1 also didn't help. Was talking with about this yesterday and came to a couple of conclusions. If heavier weight oil didn't slow consumption, then its not likely a seal problem. Probably still burning off slowly just like lighter weight oils. We agreed that a cylinder soak is my best/last hope, since I've tried almost everything else. In regards to the soak, it seems that you couldn't do all at the same time, since some of the pistons will be at the high level, and at an angle. Any fluids poured in would leak down into the exhaust system. Wouldn't you need to measure with a plastic/wood stick and soak just the pistons that are halfway or lower in its travel? I'm going to try a LC soak next week half one day, other half the next day. I'll report back how it goes.

What year? How many miles?

[mlingk]

1999 Trooper, 113K miles, original owner.

[rodeo02]

Originally Posted by mlingk

..... Wouldn't you need to measure with a plastic/wood stick and soak just the pistons that are halfway or lower in its travel?...

Any piston at top dead center *might* not take much liquid cleaner as cylinder volume would be low, but keep in mind the valves are way up high in the combustion chamber. The only place for the liquid cleaner to go would be up and out the exhaust valves, or up thru the intake valves, where it would sit in the intake runners and spill back down into the combustion chamber anyway. At any rate, you should bump the starter over once or twice during the cleaning process to move the pistons and *fluff* the rings a bit. You will need to add more cleaner if you bump the starter. Lube Control would definately be my product of choice for a cylinder soak. Seafoam would be #2 choice. Keep us posted!

G/luck
Joel

[amigo-2k]

maybe if you are doing one side, you could jack up that side to help level off the cylinders?

[rodeo02]

Over at the old ITOG board some time ago, one of the seasoned vets suggests tilting the ENTIRE truck to allow the dirty cleaner to dump out of the plug towers!! Not needed, you wouldnt get it all out that way anyway. Have the engine do the work by cranking the engine & let the pistons blow it out.

G/luck
Joel

[wb4lbg]

I put the CD2 in my '99 at the last oil change. I was checking the oil everyday at first and liking what I saw (no change in the level). But then I started checking it once a week and was seeing the level drop.

I'm now at about 1000 miles since adding the CD2 and this morning I showed the level down a little less than half a quart. This might be a slight improvement over my historical usage but since all of my miles lately have been around town it's hard to tell.

I'll keep you posted.