Piston Rings Worn Out, Time for a Rebuild

[gimpyrobb]

I would like pics of "many pistons had broken rings"!!!!

 

[74M35A2]

I would like pics of "many pistons had broken rings"!!!!

Ummm, then come over and bring your camera.

We were going to shove all the removed parts such as the pistons, bearing, rings, and gaskets, into a big pile out in the driveway, and throw it on classifieds as a used 465 rebuild kit.

 

[Aussie Bloke]

G'day everyone,.....

Thanks for the love. He rolled it over to build oil pressure with the injectors out, bled the injection, and it is ready to fire. He has worked till 4am each morning doing so during the week, so doesn't leave much time for sleep, post updates, etc....hence my input. We are filling it with coolant, firing it up, looking for leaks, bolting the hood back on, and taking it for a long drive tonight (Woodward Dream Cruise for anybody familiar with it, see you there). It will cool overnight, and he can re-torque the heads the next day and call it done. He is very interested to see how it will behave, as many of the pistons had broken rings as his daily driver and it still ran, vs now everything is fresh and correct. He also exclusively runs WMO thinned about 10% with gasoline or whatever he can find, so that plays a slight mystery card into all of this. Stay tuned, story at 11.....

View attachment 575452

I hope we get to see video of the Deuce firing up for the first time,....?
Fingers crossed for you and all the great work done.



Aussie.

 

[74M35A2]

Well, I don't want to steal Wild's thunder, so all I will do is post this pic from the cruise tonight with him and his truck (@ Arby's drive through), he can speak the rest:

 

[gimpyrobb]

Sweet!

 

[wb1895]

Thanks for the love. He rolled it over to build oil pressure with the injectors out, bled the injection, and it is ready to fire. He has worked till 4am each morning doing so during the week, so doesn't leave much time for sleep, post updates, etc....hence my input. We are filling it with coolant, firing it up, looking for leaks, bolting the hood back on, and taking it for a long drive tonight (Woodward Dream Cruise for anybody familiar with it, see you there). It will cool overnight, and he can re-torque the heads the next day and call it done. He is very interested to see how it will behave, as many of the pistons had broken rings as his daily driver and it still ran, vs now everything is fresh and correct. He also exclusively runs WMO thinned about 10% with gasoline or whatever he can find, so that plays a slight mystery card into all of this. Stay tuned, story at 11.....

View attachment 575452

Well, we are on page 11, so where is the story

 

[Wildchild467]

G'day everyone,.....





I hope we get to see video of the Deuce firing up for the first time,....?
Fingers crossed for you and all the great work done.



Aussie.

I don't have a video of it starting for the first time... I'm sorry. It did what it would do typically if you put on injector lines that were empty... it cranked a little bit and then fired off. Didn't run the smoothest for about 10 seconds and then it smoothed out. I let it run for about 4 minutes at about 1400 rpm to check for leaks and then I hit the road to run it on the highway and break it in. It starts a lot better without the need for any throttle upon start up. Doesn't quite start like a 6-71 like all it needs is half a turn and it's running, but it starts very well. I have not cold started it yet. I got it home last night and shut it down. I need to retorque the head tonight, make sure my intake an exhaust manifolds are still tight to the head, fix a possible leaky injection line at my hydraulic head, degree engine/pressure wash, check fluids and add a little more coolant (to make sure it's full) and just one more final look over of everything to see if I see any potential problems/issues. I did notice I still have some puffs of blow coming out of the slobber tube. Everything in my engine is new and can't seem to think where it is coming from. But maybe it's because the rings are not worn in yet or maybe my air compressor needs new rings? Not sure but it's better than it was before by far. Let me get the engine broke in and then I'll see how it is after. All my piston rings are aligned properly so who knows. I'm not worried about it right now. I'll put some miles on it and then re-evaluate.

The power seems a lot better I think. It seems to go through the gears a lot better and have good power. I have my fuel turned up (never adjusted it post rebuild so I could determine before and after power) and it seems to run very well. I would love to hook a load on it to see how it runs but I don't have a trailer or anything that is easy to hook on to. So far so good though!

 

[74M35A2]

I don't have a video of it starting for the first time... I'm sorry. It did what it would do typically if you put on injector lines that were empty... it cranked a little bit and then fired off. Didn't run the smoothest for about 10 seconds and then it smoothed out. I let it run for about 4 minutes at about 1400 rpm to check for leaks and then I hit the road to run it on the highway and break it in. It starts a lot better without the need for any throttle upon start up. Doesn't quite start like a 6-71 like all it needs is half a turn and it's running, but it starts very well. I have not cold started it yet. I got it home last night and shut it down. I need to retorque the head tonight, make sure my intake an exhaust manifolds are still tight to the head, fix a possible leaky injection line at my hydraulic head, degree engine/pressure wash, check fluids and add a little more coolant (to make sure it's full) and just one more final look over of everything to see if I see any potential problems/issues. I did notice I still have some puffs of blow coming out of the slobber tube. Everything in my engine is new and can't seem to think where it is coming from. But maybe it's because the rings are not worn in yet or maybe my air compressor needs new rings? Not sure but it's better than it was before by far. Let me get the engine broke in and then I'll see how it is after. All my piston rings are aligned properly so who knows. I'm not worried about it right now. I'll put some miles on it and then re-evaluate.

The power seems a lot better I think. It seems to go through the gears a lot better and have good power. I have my fuel turned up (never adjusted it post rebuild so I could determine before and after power) and it seems to run very well. I would love to hook a load on it to see how it runs but I don't have a trailer or anything that is easy to hook on to. So far so good though!

Don't let him fool you. He pulled up in front of my house un-announced yesterday with the hood still off, like a zit-faced 17 year high school old teenager with a 78' Camaro that just put new yellow Accel spark plug wires on the 305, grinning from ear-to-ear. He really had that look on his face which said "From here, I will command my people!". I was happy for him. His new squeeze is pretty cute also, the wind is finally blowing at his back.

 

[HanksDeuce]

Glad you got her back together. One helluva accomplishment getting the engine rebuilt. I think I took it easy and just replaced the entire engine/tranny.

Keep us updated on your assessment after the overhaul.

 

[gringeltaube]

Glad you got her back together. One helluva accomplishment getting the engine rebuilt. ...................Keep us updated on your assessment after the overhaul.

I think I took it easy and just replaced the entire engine/tranny.

Hah, been there - done it, and I think I know well what is easier to do....



G.

 

[gimpyrobb]

Don't let him fool you. He pulled up in front of my house un-announced yesterday with the hood still off, like a zit-faced 17 year high school old teenager with a 78' Camaro that just put new yellow Accel spark plug wires on the 305, grinning from ear-to-ear. He really had that look on his face which said "From here, I will command my people!". I was happy for him. His new squeeze is pretty cute also, the wind is finally blowing at his back.

You gotta go over and remove his drive-shafts while he is sleeping!

 

[Wildchild467]

Hah, been there - done it, and I think I know well what is easier to do....



G.

I really wanted to change the mail bearings too but it was too much work to do that I think. So I just did rod bearings. It runs good. 74M35A2 and I went out to the preview of the Woodward dream cruise tonight. He drove his bone stock M925A2 and I drove the deuce. After I got my truck in 3rd gear, I could pull away from him until I hit 50mph... that's where I stop. Made me feel good whooping that old man's truck.... I was tired of being left in the dust all the time

 

[Wildchild467]

You gotta go over and remove his drive-shafts while he is sleeping!

While the front shaft is out, maybe he can replace that stiff u-joint that I have been meaning to replace too. Haha

 

[Foxtrot Oscar]

Congrats! That was a major job of work and I'm pleased to read of your success. Well done with the documentation for others to learn from.

 

[gringeltaube]

So I just did rod bearings. It runs good....

You also changed from single- to twin-nozzle piston oilers ("double-squirters"), without touching the original oil pump? Any noticeable difference regarding OP?



G.

 

[M35A2-AZ]

Nice job!!!

 

[74M35A2]

It will just push me to install the aftermarket governor springs and turn my fuel rate up and injection timing up also on my Cummins 8.3, then you will be back in my rear-view mirrors again, where you belong.

 

[Wildchild467]

You also changed from single- to twin-nozzle piston oilers ("double-squirters"), without touching the original oil pump? Any noticeable difference regarding OP?



G.

No real noticeable difference G. I researched it a little and I found the LDT oil pump and the LDS oil pump was the same one. Feel free to double check my research though if you feel different or know something I don't. Always good to double check

Now, before the rebuild the oil pressure seemed a tad lower than normal. One thing to think about is that is with the factory gauge and it could be error in the sending unit or gauge. 2 days ago I bought a mechanical gauge and hose that i can tap into the oil pressure galley and see what it is with a good mechanical gauge. Using the factory electric oil pressure gauge on the dash, the idle oil pressure now reads about 30-32 PSI when warm (around 40 PSI cold) and 60-65 PSI going down the highway at 2200 RPM. If i rev it up to about 1800 when it is still warming up, the oil pressure goes up to about 70-75 PSI. All of my pressure readings are about 10 PSI lower across the board than what the truck traditionally had, even before the rebuild. I don't contribute any of these oil pressure readings to the rebuild at the moment because these were the same readings I got before I rebuilt it. I need to put a mechanical gauge on the engine (only for testing) to see if my sending unit, gauge or ground connection is going bad. It only makes sense to double check my oil pressure readings with known good gauge.


Another thing to note is i have the early style oil pressure regulator. I don't know if there is any advantage to the late style oil pressure regulator or not for me to switch? I just want good oil pressure so I don't have to worry, but I think right now it is still in spec. Again, if there was an advantage of the late style oil pressure regulator, I would rather swap it out someday and not worry. I do like the idea of having the double "nozzle" (the TM called them nozzles) piston coolers just to have the added protection against hot pistons. I never run it hotter 1150 degrees anyway.

 

[Wildchild467]

It will just push me to install the aftermarket governor springs and turn my fuel rate up and injection timing up also on my Cummins 8.3, then you will be back in my rear-view mirrors again, where you belong.

If the springs didn't rust away in your tool box.

 

[gringeltaube]

..... I do like the idea of having the double "nozzle" (the TM called them nozzles) piston coolers just to have the added protection against hot pistons....

I do too. My only concern was/is that eventually the std. pump would be insufficient and the oil pressure dropped too low after the oil got hot?
Read this post... According to the books only the LDS465-2 came with these 2x squirters but then the oil pump of that model engine also has a higher output: 29 gpm, vs. 22 gpm for all others. (TM 9-2815-210-34-2-1, page 1-14).

I have yet to compare the size of orifices. Maybe the "double-squirters" have smaller holes?



G.