Author Topic: 8v92 differences  (Read 17876 times)

Offline luvrbus

  • Hero Member
  • *****
  • Posts: 26570
Re: 8v92 differences
« Reply #15 on: February 18, 2025, 10:01:46 AM »
...But with more experience it became pretty obvious that the MCI-102x3 twin side radiators weren't up to the task, even though they were larger than previous MCI models, of keeping the monstrous heat produced by the 8V-92 from building up and causing engine overheating issues...

Hence the reason I added the 3rd radiator...

I didn't know but MCI had a desert package for their buses ,the MCI 9 I have here has radiators almost 3 inches thicker than your radiators or Mikes with a different blower fan ,it is a AZ prison bus with a 8v92 ,MCI buses just don't have enough surface area to cool IMO  with the 2 side radiators ,the D with the 2 rear mounted for the 8v92 don't over heat
Life is short drink the good wine first

Offline Glennman

  • Hero Member
  • *****
  • Posts: 775
  • 1974 MCI MC-8 8V71 Turbo/2002 MCI D4500 Series 60
Re: 8v92 differences
« Reply #16 on: February 18, 2025, 08:59:51 PM »
I currently live in the gigantic metropolis of Sequim, WA
Hey Preacher57! Lord willing, my grandson and I will be in Sequim with the bus in April. It depends on how the test drive comes out next weekend after installing the new air compressor. My parents used to live in Port Townsend so we used to frequent the area a lot. We're in Yakima WA.

Offline preacher57

  • Newbie
  • *
  • Posts: 5
Re: 8v92 differences
« Reply #17 on: February 20, 2025, 09:35:29 AM »
Lots of interesting things to ponder.
I have since run a few other tests and found that the fuel pressure is just above 20 at idle and about 70 when revved up.
Lots of oil pressure but it goes down to about 15 at idle.
I drove it 120 miles the day I bought it and now, when I run it in the driveway, it drools constantly from the tubes and also oily black dripping out every exhaust clamp there is!
I researched it an I suspect "wet stacking" even though I drove it so far when I brought it home. I panicked when I saw the volume of drool and the drips coming off the exhaust clamps/joints, but after shut down, I checked the dipstick and the oil is fine. So I have to conclude that it's unburned fuel or MASSIVE blowby...But again- if it was blowby, the oil would dissapear from the engine but it doesn't seem to be.
I have no idea how many miles are on this but by doing a little detective work, I can tell it's been apart or out at some time in the past.  Lots of hose hangers are not screwed to the bulkheads as they should be and vacuum likes hanging loose where they were obviously secured to the walls from the factory. It's the silver 92 and the poor thing is layered in a 1/8 inch of oily road grime ( maint issues) I pressure washed it a little bit, but it was below freezing and everything was so cold that it didn't do much.
So; Plenty of oil and fuel pressure, it idles and spins up fine, a bit of excessive smoke, but not undriveable, And it drools like a 7-year old's nose with a cold.
I can't let it keep dripping out the exhaust like this.... Thoughts????
I can start saving my mad money for an in-frame if I have to. I guess next steps are to pull a cover off and see what the rings and cylinders look like.
Thanks for all the replies!!!

Offline luvrbus

  • Hero Member
  • *****
  • Posts: 26570
Re: 8v92 differences
« Reply #18 on: February 20, 2025, 10:21:59 AM »
It has a problem start saving you money ,they wet stack with low compression, take a IFR hand held thermometer and shoot each port on the exhaust manifold they should be with 10 or 15 degrees of each other .You are not going to see the 2 oil rings through the inspection covers only the top 3 rings and when you pull the covers you can tell which cylinders are pumping oil or fuel.If the oil is diluted with fuel they can have the same signs as your engine ,I doubt it though with your oil pressure 15lbs at idle is good for a 8v92 
Life is short drink the good wine first

Offline preacher57

  • Newbie
  • *
  • Posts: 5
Re: 8v92 differences
« Reply #19 on: February 21, 2025, 09:18:27 AM »
OK, A real redneck-ish idea that a local diesel guy told me to do and it sounds iffy.
He said to "put a brick on the pedal and let it run on the governor for an hour or so and it'll clean out everything.!"  While I agree with the concept to a degree, I don't know about the collateral damage and the actual efficiency of such practices.
The thing runs decent as it is now, just not real healthy. The last thing I need is a dead bus in the driveway. 

Offline luvrbus

  • Hero Member
  • *****
  • Posts: 26570
Re: 8v92 differences
« Reply #20 on: February 21, 2025, 09:37:02 AM »
OK, A real redneck-ish idea that a local diesel guy told me to do and it sounds iffy.
He said to "put a brick on the pedal and let it run on the governor for an hour or so and it'll clean out everything.!"  While I agree with the concept to a degree, I don't know about the collateral damage and the actual efficiency of such practices.
The thing runs decent as it is now, just not real healthy. The last thing I need is a dead bus in the driveway.


They won't clean up without being under a load, the brick is not a good idea , what is the coolant temperature,they slobber a lot if not over 180 degrees 
Life is short drink the good wine first

 

SimplePortal 2.3.7 © 2008-2026, SimplePortal