Look Inside My 6v92 Cylinder Liners (VIDEO)

GnarlyBus · June 25, 2018, 11:20:02 AM

Yah, probably best to roll the engine out and do a complete overhaul. It will be much easier to get to everything and do better work.

This has escalated quickly from a coolant leak a week ago. I guess that's how these things go. I'll hope for the best and plan for the worst. We don't really know for sure until we get the engine open, but it helps to be prepared for the possibilities.

We don't have much money into the bus so if it's time to put more in, its definitely worth it to us. It's not ready for mountain cabin status! I'm glad that it has gotten us 3.5 years down the road with only a few small repairs and maintenance.

eagle19952 · June 25, 2018, 11:56:46 AM

Quote from: GnarlyBus on June 25, 2018, 11:20:02 AM
Yah, probably best to roll the engine out and do a complete overhaul. It will be much easier to get to everything and do better work.

You could get lucky and find a better running take out...again, do your research

GnarlyBus · June 25, 2018, 12:22:56 PM

Quote from: eagle19952 on June 25, 2018, 11:56:46 AM
You could get lucky and find a better running take out...again, do your research

I've seen this said on threads a few times. Help me out, I don't understand the idea of starting all over with another engine unless this one is totally cracked and unusable. Wouldn't a takeout be 2k (for one that needs rebuilt) to 4k (for one that allegedly is in "good" shape)anyways? Wouldn't I have to assume it needs rebuilt anyways so I don't do all the work of replacing it only to find it needs stuff too? Or am I missing something?

eagle19952 · June 25, 2018, 12:33:31 PM

Quote from: GnarlyBus on June 25, 2018, 12:22:56 PM
I've seen this said on threads a few times. Help me out, I don't understand the idea of starting all over with another engine unless this one is totally cracked and unusable. Wouldn't a takeout be 2k (for one that needs rebuilt) to 4k (for one that allegedly is in "good" shape)anyways? Wouldn't I have to assume it needs rebuilt anyways so I don't do all the work of replacing it only to find it needs stuff too? Or am I missing something?

let me rephrase.
IF you get extremely lucky.

GnarlyBus · June 25, 2018, 12:35:39 PM

Haha. Ok.

Jim Blackwood · June 25, 2018, 02:39:47 PM

Did you ever find out where the coolant was coming from?

If it was getting in the combustion chamber that could account for the ash and the scuffing, although it would be more likely you would have one clean piston if there is a crack. Have the heads very carefully examined for any signs of cracking, also the head gaskets. If the heads are good and you identify the coolant leak as repairable then new pistons, liners and rings are the way to go. Plus a head rebuild of course. The liner kit isn't usually that expensive compared to the overall cost of a rebuild, better to do it right, do it once. You might get by with reusing the parts you have, but the less compression you lose the easier it will start and the more power it will make.

Jim

GnarlyBus · June 25, 2018, 04:02:18 PM

See my other thread for more info on the leak and a video. It is coming from outside the cylinder so likely a cylinder liner seal.

Jim Blackwood · June 26, 2018, 12:18:21 PM

Right. Well the scuffing in that one cylinder would be the thing that concerns me more than anything else.

Jim

DoubleEagle · June 26, 2018, 05:06:38 PM

Quote from: GnarlyBus on June 24, 2018, 03:28:39 PM
While thinking about the work ahead of me to repair the cylinder liner seal on my 6v92 that is leaking coolant out of the air box drains (see my other thread), I decided to stick my endoscopic camera through the liner ports and see what could be seen.

https://youtu.be/QHFbpLsYTPE

Your endoscopic camera did a decent job of recording images, is it a more economical camera, or something more pricey? What is the smallest hole it can go into?

GnarlyBus · June 26, 2018, 05:21:14 PM

If you search Amazon for Depstech endoscopic camera" you'll find some different options from under $20 to $40. They make ones that plug into iphones, androids, laptops, etc. It's pretty cheap if you have something like a smart phone or laptop to plug it into.

The head is 1/3" diameter and the cord is pretty long. They come with attach enemy's like mirror, hook, etc.

richard5933 · June 26, 2018, 06:08:09 PM

Quote from: GnarlyBus on June 26, 2018, 05:21:14 PM
If you search Amazon for Depstech endoscopic camera" you'll find some different options from under $20 to $40. They make ones that plug into iphones, androids, laptops, etc. It's pretty cheap if you have something like a smart phone or laptop to plug it into.

The head is 1/3" diameter and the cord is pretty long. They come with attach enemy's like mirror, hook, etc.

I've got the same setup - works great and definitely worth the money. It's not in the bus along with all the other roadside tools. Lots better than a cell phone on a stick. Mine connects to the smartphone with a direct wifi connection.

Dave5Cs · June 26, 2018, 07:27:12 PM

I have one similar to yours and hook or tape it to a fish tape to look down drains and pipes etc also. Mine hooks to my laptop or smart phone, etc. i think it was 15.00 on Amazon. don't remember who make it. They do mention to be careful because some of the lens on some units seem to come of.

luvrbus · June 26, 2018, 07:56:26 PM

I have a cheap Harbor Freight inspection camera there is plenty of space in the liner ports for the camera head ,then I have better digital with the FLIR heat imaging feature it is a good camera cost more and I cannot tell the difference on video between the cheap H/F or it,only difference is the H/F gets replaced every 2 years for free lol best 3 bucks I ever spent for a warranty

Geoff · June 27, 2018, 06:31:07 PM

As long as the crank and cams aren't scored you can do an in-frame no problem. This current case sounds like it was created by overheating 3 years ago and I am sure looking at the video it was using oil. The heads definitely need work, new piston kits, new bearings, and a look of the cam lobs and cam followers. And to do a good job, check the turbo and blower. Rebuilt injectors.

rsgallo · July 16, 2018, 12:12:42 PM

I am just completing my repairs of similar problems on a 6V92 in a 4106. It is laid over 43deg. I had been losing about a gallon every 350mi. Not visible in the oil, but when tested, it had coolant in it. This has been going on for a while (actually since the last rebuild). I took it down at 21K mi since the rebuild. Bearings very worn, but crank OK. Found a bad injector cup (#2). Found leaking at the aftercooler plugs in the air box. The Harbor Freight camera confirmed this by going through the low pistons into the airbox. Found some scuffing on the #6 liner. This is the one right under the leak in the airbox. Found all the o rings deteriorated on the low side (2, 4, 6) liners. Found stuck #1 compression ring on all the low side cylinders. Carboned ring grooves on that ring. Found broken oil control rings on #6. Fixed all this stuff. What has me baffled is why the o ring damage is all on the low side, 2,4,6 where the cylinders are almost level. And why the o rings with damage are the wet side (there are two, one toward the coolant and the other to the airbox for each liner) and all at the bottom. 6 o'clock when looking at the liners installed in the block looking in at the rear of the bus. I used Power Cool since the rebuild. The water jacket is spotless clean. Yes, I have run it hot on occasion, but the leaking was from day one. I have to think the o rings deteriorated gradually. But....

Why does gravity matter? Wouldn't the top side cylinders be more likely to suffer trouble due to hot running?