| Author |
Message |
mark scaife (Markwb)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, March 29, 2006 - 12:16 am: | |
how many miles is a well maintained 8v71 good for. best case ? worst case ? the coach i'm looking at is a mci 5a 1967 with 300,000 miles on the engine .
thanks ...
mark |
Brian Brown (Blue_velvet)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, March 29, 2006 - 3:22 am: | |
Hard to say... it might be a boat anchor already OR have a couple hundred thousand left in her. If it's at all cold out, try to fire it up and see how easy it starts and how much smoke billows out.
If it's babied, given the right fluids (CF2 40 wt.), and given a steady diet of block heater before you take anywhere in the winter, it might last many, many more miles.
HTH,
Brian Brown
PD4106-1175 |
Geoff (Geoff)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, March 29, 2006 - 8:14 am: | |
Some people manage to get 500,000 miles off an 8V71, I have even read articles of some lasting close to a million miles. However, my experience with 8V71's and 92's is that they need an overhaul between 250,00-300,000 miles. So even if it is running good now at 300,000 that could change at any time. The best thing to do is take a compression check, a new non-turbo (NA) 8V71 will have 550 lbs of compression, once the compression drops below 500 lbs it gets harder and harder to start.
--Geoff
'82 RTS AZ |
Phil Dumpster2
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, March 29, 2006 - 8:48 am: | |
Strangely enough, they seem to last longer in city transit service than in highway service. |
David Dulmage (Daved)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, March 29, 2006 - 11:10 am: | |
Could be partly preventative maintenance. Some transit companies are very rigourous in their maintenance programs. |
John MC9
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, March 29, 2006 - 3:09 pm: | |
"how many miles is a well maintained 8v71 good for.
best case ? worst case ? the coach i'm looking at is a
mci 5a 1967 with 300,000 miles on the engine . "
This topic came up a few threads back... The engine is
only one small part of the possible expensive problems.
Worn pinions, sour transmissions, suspension problems,
rust... all can play a major part in deflating your wallet.
You asked about 39 year old "a well maintained 8v71".
Are you sure it was "well maintained" for all of it's 39 years?
Maybe back in 1970 it ran for four days, four gallons low
in oil... Run hot into the red zone for a thousand miles...
Idled for fifteen days straight, in the Yukon..
Have it inspected bumper-to-bumper; see what else may
possibly wrong with it.. If the engine doesn't smoke, runs
fine and doesn't overheat running at max rpm on the road
for an hour, it's probably going to be OK.
What happens a week after you buy it, is something
you get concerned with, when it happens. You're buying
a used piece of heavy machinery that given it's commercial
owner reason to unload it instead of use it. Expect bad
things. When they don't happen, rally and brag (and kiss it's
exhaust pipe). |
Jarlaxle
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, March 29, 2006 - 5:58 pm: | |
Have the oil analysed. Cheapest way I know of to tell how healthy it is.
I've seen a perfectly-running 8V71 in a GMC General semi tractor with almost 550K since an in-frame. Last I saw it, it was still running fine. |
FAST FRED
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, March 30, 2006 - 5:51 am: | |
"You asked about 39 year old "a well maintained 8v71".
I have never heard of a bus that old that didn't have a dozen engines replaced in its commercial service life.
At 300,000 it's at least time for an inframe , and you will have another 200,000+ with ease.
If cash is a problem , just the bearings can be changed out , bringing the oil pressure up .
A day or two of skilled grunt work.
FAST FRED |
Dravo
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, March 30, 2006 - 9:05 pm: | |
Many of the guys getting the really high miles have added by-pass oil filters to keeep the lube squeeky clean. |
Jarlaxle
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, March 31, 2006 - 5:20 pm: | |
"At 300,000 it's at least time for an inframe, and you will have another 200,000+ with ease."
No. Why tear apart an engine that still holds plenty of oil pressure? As I said: GMC General,, 550,000+ miles, most of them loaded to 80,000lbs, still running fine.
It's also pushing twice the factory power for an 8V71 (enough that I've seen it shoot flames out the stacks), and will spin 2500RPM.
Oil is SAE40W Delo or Rotella, changed at, IIRC, 12,000 miles. |
mark scaife (Markwb)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, April 01, 2006 - 12:17 am: | |
thanks for all the info, i have alot of experience with cat and cummins 4 stroke engines but not on these 2 stroke detroits. it's going to take some getting used to especialy with the torque range and only 4 gears. thanks again i'm sure i'll be back for more .
mark.... |
truthhunter@shaw.ca
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, April 01, 2006 - 8:41 am: | |
J- axle,I have also heard this immortal "Deroit Double Strength Jummin`Jimmy claim" from fellow road slaves and when I told them about the TV episode with Al Bundy and his million mile Dodge Dart and how they should sell it back to the factory if only they could document that was a "in fact" truth, they all call me a @*###* hole.
Well happy National Atheist Day (happy April 1st for the rest of you fine busin` folks)& everyone please remember to pull a good joke on at least one loved one before midnight! |
Jarlaxle
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, April 01, 2006 - 10:04 am: | |
Truthhunter, are you drunk? |
truthhunter@shaw.ca
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, April 01, 2006 - 3:13 pm: | |
not for at least 13 years, I am however normaly just like this, unable to beleive what I hear when it don't make sense! |
Geoff (Geoff)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, April 01, 2006 - 3:44 pm: | |
What, an early April Fools joke?-- 550k on 8V71 pushing twice the factory power (flames out the stack!) spinning 2500 RPMs. Sound like a truck stop story. Who where you saying was drunk here? |
Jarlaxle
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, April 01, 2006 - 9:03 pm: | |
I saw the truck (hell, I DROVE it a couple times). I saw the truck with the engine apart during its last IFO.
Of course, the only ones to drive it cranked up that high are very aware of how easy it would be to melt something...it's since been dialed back considerably (about 350-375HP & 2200RPM, IIRC) for another driver. It's a little worn (REALLY doesn't like to light off below 15 degrees), but still runs fine.
And flames out the stack of a non-turbo diesel aren't all that unusual...they used to be common enough to be mentioned in a very-popular song.
For that matter, didn't someone on this board have close to 1,000,000 miles on an unrebuilt 8V71 in an MCI? |