Engine removal this summer

[MagnoliaBus]

Hello everyone,

This summer i plan to remover the engine/tranny craddle.
I plan to start cleaning the exterior and the remove and replace all the hoses, sensor and wiring harness.
I will remove the air box cover to look at the pistons for scoring and also check tension with a small screwdriver for broken rings.
I also plan to remove the oil pan and check a main bearing and a connecting rod bearing for pitting and or scoring.
Then i will decide if i do an overhaul.

Any suggestions ?

[luvrbus]

Hello everyone,

This summer i plan to remover the engine/tranny craddle.
I plan to start cleaning the exterior and the remove and replace all the hoses, sensor and wiring harness.
I will remove the air box cover to look at the pistons for scoring and also check tension with a small screwdriver for broken rings.
I also plan to remove the oil pan and check a main bearing and a connecting rod bearing for pitting and or scoring.
Then i will decide if i do an overhaul.



The rings that break most of the time are the oil rings and those you need to remove the piston to check

Any suggestions ?

[MagnoliaBus]

Do i need to worry about those rings and open the engine ?

[chessie4905]

Smokes a lot when started cold? Blue smoke haze when getting into throttle? What is your hot oil pressure at idle?

[MagnoliaBus]

No noticeable smoke. I don't remember the exact oil pressure value but it was ok.
With a piston at TDC, i guess it would be possible to inspect the lower portion of the liner, from under the engine with a flashlight ?
A broken oil ring would leake scoring mark ?

[Utahclaimjumper]

 If it ain't broke don'r fix it.>>>D

[bevans6]

Not sure why you are doing this.  Everything you mention can be done with the engine in the bus, but from what you mentioned the engine is running well at this time, no issues, no smoke, good oil pressure.  I'm in the "if it ain't broke, don't fix it" camp.  Not to say that it might be at the mileage that calls for some preventative maintenance - what is the mileage?  Bearing issues can often be diagnosed with an oil analysis.

Anyway, if you are going to pull the engine, my advice is park on smooth concrete, get a fork lift, pallet truck (or a powered pallet truck, which might even be better than a fork lift), build a cradle to pick up the engine and pull it out.  That's what I did the second time I pulled my engine out.  The first time I built a rolling stand, but a pallet truck is far easier.

If you had oil control ring issues you'd have smoke, fairly continuous blue smoke.  You can't inspect them through the ports because they stay below the air intake ports in the liner.  They would not necessarily make score marks, but the oil rings are on the very bottom of the piston, so if there are marks you'd see them.

[MagnoliaBus]

First of all, i need to repair some rusty structure under the radiator, behind the rear lights and the sheet metal over the engine.
So pulling out the engine craddle will allow me to redo it all, cut, weld, buff, sandblast and recoat the entire engine bay.
I was told it's a replacement engine coming from a fire truck...so don't know the milleage. I never had a chance to drive the bus, except when unloading it from the towing platform.

That's why i want to renew as much of the engine as i can while it's out. Clean and painted with new harness, sensors and hoses, it will be perfect for the clean bay.

[chessie4905]

You sure it's still a 92?

[luvrbus]

Should be DDEC 8v92 in that model of Prevost

[MagnoliaBus]

Yes, DDEC II with the sticker on the ECM saing version 154, so the latest build.

[Van]

Will be an easy pull if you have access to every thing. Be sure to take before and after photos, Everyone loves a pretty engine and bay.

[MagnoliaBus]

I sure will take a lot of pictures !
Like the picture, this is how i plan to remove the engine.

[bevans6]

Well, you live in Prevost country so expertise should be easy to find.  When I was moving to Nova Scotia I was running up and down AR20 four or five times a month, and always noticed the Prevost places along side the highway.  I used to stop for fuel at a Esso station at the Montmagny exit, and there was an unmarked building next door, plus a big bay door on the service station building.  One time I was there and the bay door was open - it was a paint booth and a brand new Prevost RV shell was getting a custom paint job, there were two more fully masked buses in the parking lot (just the driver's windshield was open) and the doors of the unmarked building were open revealing around a 10 - 12 bay bus workshop.  Very neat, sez I...

[Oonrahnjay]

  ... Esso station at the Montmagny exit, ... Very neat, sez I...  

    Montmagny!  My Quebecois accordeon was made in Montmagny.  I go to visit most summers.  I had no idea that the buildings at "Prochaine Sortie" were bus shops.