8v92 rebuild

[David Anderson]

This is cool.  They make it look so easy.

https://www.youtube.com/watch?v=C-upVS5HHGQ

David

[muldoonman]

Follow the cat as he travels and works on a lot of the older buses. Some in bad shape before he starts. Wonder when you should roll a set of bearing into a 8V92TA. Heard some say 100,000 miles and others 200,000. Mine has 96,000 on it now.

[luvrbus]

Glen 150,000 miles is when I pull one down for bearing in the engine and the famous 50D alternator then they good for the end which is between 350 and 400,000 miles,the DDEC seems to have a more even wear pattern that a older mechinal  8v92 fwiw .This is the way I like to do a 8v92 I am not much into the inframes kits

[TomC]

At least it used to be-every 100,000 miles adjust valves and run rack (mechanical engines); every 200,000 miles roll in main and rod bearings; every 300,000 miles rebuild blower and turbo, new injectors; 500,000 miles rebuild whole engine if needed. I rebuilt my 8V-92TA at 500,000 miles. The cylinder liners were still showing hone marks, but I wanted the up dated cylinders and pistons. Oil consumption went from 1,200 miles to 2,200 miles per gallon.

Then I bought my truck with Caterpillar 3406B. Maintenance on that-adjust valves every 200,000 miles, roll in bearings at 500,000 miles, rebuild at 1 million. What a difference! Good Luck, TomC

[luvrbus]

Buses take a toll on engines they don't last as long as the truck engines out in the fresh air

[chessie4905]

How much to rebuild at 1 million miles?
How many conversion owners will see 250,000, let alone 500,000 or 1,000,000 miles? At 250,000, 31,250 gallons of fuel@ 8 mpg. About $130,000.

[richard5933]

Wow - I'd have to put mine into revenue service to ever see numbers like that! Just turned 50K this summer.

[luvrbus]

The 3406 was the best engine ever built and simple to work on ,you could lug it down to 900 rpm and give it throttle and it would pick back up I loved that old engine

[chessie4905]

Sorry. The 6-71 was.

[luvrbus]

Sorry. The 6-71 was.

You are joking right ,in the oil patch those were 4000 hr engines,I have worked on many single,duplex and quads 6-71's they never lasted long working hard 24 hours a day

[DoubleEagle]

The 6-71 sounds sweet, but it would not last as long as a 3406, which also (in it's own way) sounded very authoritative. I had one in a Mack R700 that would out-pull 8V92's in the mountains (of Northern New Hampshire) to such an extent that it could run one or two trips more in a day. As a driver, the 3406 is king, from Cliff's mechanical view, it is the best. The Series 60 is close in quality, but the torque of the 3406 is outstanding. 

[chessie4905]

Im not talking about how long they last, necessarily. Even 60 series are pretty decent. How much are 3406 parts and cost to rebuild?

https://itstillruns.com/history-detroit-diesel-671-tib-12210825.html

[muldoonman]

Glen 150,000 miles is when I pull one down for bearing in the engine and the famous 50D alternator then they good for the end which is between 350 and 400,000 miles,the DDEC seems to have a more even wear pattern that a older mechinal  8v92 fwiw .This is the way I like to do a 8v92 I am not much into the inframes kits

Thanks Cliff don't know if I'll make it to 150,000 but good to know. After having my blower redone a year or so ago it went back to almost no oil usage.

[luvrbus]

Im not talking about how long they last, necessarily. Even 60 series are pretty decent. How much are 3406 parts and cost to rebuild?

https://itstillruns.com/history-detroit-diesel-671-tib-12210825.html

Parts for the 3406 wasn't that bad maybe 5 to 8% more than a Detroit, injection pumps were a little costly to rebuild but they never gave much problems, the 3406 was not as labor intensified as a 2 stroke though 

[lostagain]

I love Detroit 2 strokes, but I love a Cat 3406 too. Agreed the torque is phenomenal. I have one in my Pete dump truck with 13 speed. I've been driving one in a grain truck lately with an 18 speed. A treat for sure. And sounds good too. Better than a S60...

JC