Reply
 
Thread Tools Display Modes
 
Old 07-04-2016, 11:25 AM   #1
New Member
 
Join Date: Jul 2016
Posts: 3
Ignorant Detroit parts questions

Top of the morning, you geniuses. I recently got my hands on a 1982 Crown Coach with a mid-body Detroit 6?71 turbo. It's in need of the usual I-sat-for-five-or-six-years tuneup and fluid flushing and filter changing and whatnot, so... Did crown ever use the 6L71, or did they exclusively bolt the 6N71 into their buses? Do they take the same filters as a 6V71? Either way, where is the best place to order such things from, along with a new air cleaner element and all that good stuff? On another random note, the oil pan has a very, very small hairline crack in one of it's corners, resulting in a slow but noticeable loss of oil over time. I was instructed to take the pan off and "re-brass" it. Is this a simple task, or would I be better off finding another pan? If so, where? Nobody around here (Northern California) seems to know what a mid-body Detroit engine is, let alone find parts for it. Any input is much appreciated, and thank ya kindly. =]
Hoopda is offline   Reply With Quote
Old 07-04-2016, 11:38 AM   #2
Bus Geek
 
Tango's Avatar
 
Join Date: Mar 2011
Location: Houston, Texas
Posts: 5,287
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
Rated Cap: 15
Can't help with part finding but if you have access to a welder, drill a small hole at the end of the crack and just weld it up. I'm guessing a new or used replacement is gonna be hard-ish to come by.
Tango is offline   Reply With Quote
Old 07-22-2016, 12:08 PM   #3
Bus Nut
 
Join Date: May 2016
Location: Pacific North Wet
Posts: 743
Year: 2002
Coachwork: Bluebird
Chassis: All American RE (A3RE)
Engine: Cummins ISC (8.3)
Rated Cap: 72
Quote:
Originally Posted by Hoopda View Post
Top of the morning, you geniuses. I recently got my hands on a 1982 Crown Coach with a mid-body Detroit 6?71 turbo. It's in need of the usual I-sat-for-five-or-six-years tuneup and fluid flushing and filter changing and whatnot, so... Did crown ever use the 6L71, or did they exclusively bolt the 6N71 into their buses? Do they take the same filters as a 6V71? Either way, where is the best place to order such things from, along with a new air cleaner element and all that good stuff? On another random note, the oil pan has a very, very small hairline crack in one of it's corners, resulting in a slow but noticeable loss of oil over time. I was instructed to take the pan off and "re-brass" it. Is this a simple task, or would I be better off finding another pan? If so, where? Nobody around here (Northern California) seems to know what a mid-body Detroit engine is, let alone find parts for it. Any input is much appreciated, and thank ya kindly. =]

I have been researching that motor myself. As best I understand so far, with the exception of the oil pan, oil pump and starter most parts from a standard 671 (not 6v71) will interchange with the "pancake" 671.

I have seen Crown's with both naturally aspirated and turbocharged Detroit's.

I am not a welder but I would surely take care getting that oil pan repaired as it is one of the few "rare" parts on that motor.

I have put a few hundred thousand miles on Detroit two strokes and I do love them in a strange and twisted way. I think some of that leaking Delo 100 gets in your blood....
PNW_Steve is offline   Reply With Quote
Old 07-22-2016, 10:37 PM   #4
Bus Crazy
 
Stu & Filo. T's Avatar
 
Join Date: Sep 2013
Location: Vacaville, Ca
Posts: 1,391
Year: 1988
Coachwork: Crown / Pusher
Engine: 8.3 Cummins
Quote:
Originally Posted by Hoopda View Post
Top of the morning, you geniuses. I recently got my hands on a 1982 Crown Coach with a mid-body Detroit 6?71 turbo. It's in need of the usual I-sat-for-five-or-six-years tuneup and fluid flushing and filter changing and whatnot, so... Did crown ever use the 6L71, or did they exclusively bolt the 6N71 into their buses? Do they take the same filters as a 6V71? Either way, where is the best place to order such things from, along with a new air cleaner element and all that good stuff? On another random note, the oil pan has a very, very small hairline crack in one of it's corners, resulting in a slow but noticeable loss of oil over time. I was instructed to take the pan off and "re-brass" it. Is this a simple task, or would I be better off finding another pan? If so, where? Nobody around here (Northern California) seems to know what a mid-body Detroit engine is, let alone find parts for it. Any input is much appreciated, and thank ya kindly. =]
Did they say brass or Braze ??? Where in Nor Cal are you??
Stu & Filo. T is offline   Reply With Quote
Old 07-27-2016, 11:09 AM   #5
New Member
 
Join Date: Jul 2016
Posts: 3
Quote:
Originally Posted by Stu & Filo. T View Post
Did they say brass or Braze ??? Where in Nor Cal are you??
They said brass. I'm over in Trinity county, way up in the middle of nowhere. I also discovered that this is a 6L71, not a 6N71 as I suspected... I also managed to clean enough crud off the ancient filters to find parts numbers and acquire those, so things are going smoothly... Finding the gigantic Farr air filter that matched up to the partial number I had was entertaining, but it worked out. Steve, do you know if the oil pan gasket from a regular 6 71 will also match up to the pancake? That part is the last one on my list I'm having trouble tracking down.
Hoopda is offline   Reply With Quote
Old 07-27-2016, 11:54 AM   #6
Bus Nut
 
Join Date: May 2016
Location: Pacific North Wet
Posts: 743
Year: 2002
Coachwork: Bluebird
Chassis: All American RE (A3RE)
Engine: Cummins ISC (8.3)
Rated Cap: 72
Quote:
Originally Posted by Hoopda View Post
They said brass. I'm over in Trinity county, way up in the middle of nowhere. I also discovered that this is a 6L71, not a 6N71 as I suspected... I also managed to clean enough crud off the ancient filters to find parts numbers and acquire those, so things are going smoothly... Finding the gigantic Farr air filter that matched up to the partial number I had was entertaining, but it worked out. Steve, do you know if the oil pan gasket from a regular 6 71 will also match up to the pancake? That part is the last one on my list I'm having trouble tracking down.
That is a great question....

I can tell you that the oil pans will interchange so I would expect that the gasket would be the same.

I did a bit of checking and I cannot find any reference to a different gasket.

These folks can give you a definitive answer: Detroit Diesel 71 Series Oil Pan Gasket | 271 | 371 | 471 | 671
PNW_Steve is offline   Reply With Quote
Old 07-27-2016, 12:02 PM   #7
Bus Nut
 
Join Date: May 2016
Location: Pacific North Wet
Posts: 743
Year: 2002
Coachwork: Bluebird
Chassis: All American RE (A3RE)
Engine: Cummins ISC (8.3)
Rated Cap: 72
A word of caution regarding DD two strokes that have been sitting for a while.

I have heard a number of stories of stuck injector racks, failed blower seals and random oil/fuel accumulation in the blower. Any of these can cause an engine runaway upon starting.

I would recommend that at a minimum you have an emergency shutdown procedure. Generally this is some method of cutting off the air to the intake. A better option would be to have a DD mechanic on hand when you get ready to start for the first time.

Not trying to scare you away from DD just want you to be aware of a potential challenge that you should be aware of.
PNW_Steve is offline   Reply With Quote
Old 07-27-2016, 12:11 PM   #8
Bus Geek
 
Tango's Avatar
 
Join Date: Mar 2011
Location: Houston, Texas
Posts: 5,287
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
Rated Cap: 15
Most DD's with superchargers have an emergency shut down plate and handle on the dash. If so...check it out before starting to make sure it is functional. Steve is absolutely correct about the potential for a "run away" and they ain't pretty.
Tango is offline   Reply With Quote
Old 07-27-2016, 01:56 PM   #9
Bus Nut
 
Join Date: May 2016
Location: Pacific North Wet
Posts: 743
Year: 2002
Coachwork: Bluebird
Chassis: All American RE (A3RE)
Engine: Cummins ISC (8.3)
Rated Cap: 72
Quote:
Originally Posted by Tango View Post
Most DD's with superchargers have an emergency shut down plate and handle on the dash. If so...check it out before starting to make sure it is functional. Steve is absolutely correct about the potential for a "run away" and they ain't pretty.
I have seen those on other peoples rigs. It just happened that the ones I have owned did not come with one so I had to cobble together my own.
PNW_Steve is offline   Reply With Quote
Old 07-27-2016, 03:27 PM   #10
Bus Geek
 
Tango's Avatar
 
Join Date: Mar 2011
Location: Houston, Texas
Posts: 5,287
Year: 1946
Coachwork: Chevrolet/Wayne
Chassis: 1- 1/2 ton
Engine: Cummins 4BT
Rated Cap: 15
Quote:
Originally Posted by PNW_Steve View Post
I have seen those on other peoples rigs. It just happened that the ones I have owned did not come with one so I had to cobble together my own.

Good plan. I am working on an emergency shutdown device for my little 4BT. Personally, I think every diesel should come equipped with one. I am actually considering an RV blackwater dump valve on the air intake side of the turbo. The "real deals" work just the same...they just cost about $600 bucks more.
Tango is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Virginia Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 08:01 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.