| Author |
Message |
    
dirk steen
New member
Username: quite_the_ride
Post Number: 2
Registered: 05-2009
| | Posted on Sunday, May 10, 2009 - 05:12 pm: | 
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how many hrs can be expected from these engines before overhaul, |
Jimmy Graves
Member
Username: jimg4652
Post Number: 27
Registered: 11-2008
| | Posted on Monday, May 25, 2009 - 10:18 pm: |
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Depends on how well it has been taken care of.
Up to 3K hours maybe. |
dirk steen
Member
Username: quite_the_ride
Post Number: 4
Registered: 05-2009
| | Posted on Wednesday, May 27, 2009 - 10:35 am: |
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Thanks jimmy, the engines have 3000 hrs,They have been mantained well, The compression is at minimum 420 lbs and is down in speed about 4 knots. |
john roe
Member
Username: maverick44
Post Number: 12
Registered: 12-2008
| | Posted on Tuesday, June 02, 2009 - 07:42 am: |
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Tolerance for variation in cylinder compression on these engines is within 25 psi of 475 psi...If you are at 420, I think most Detroit mechanics would suggest it is well time for a major |
Jimmy Graves
Member
Username: jimg4652
Post Number: 35
Registered: 11-2008
| | Posted on Tuesday, June 02, 2009 - 06:09 pm: |
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Not saying you're wrong, John, I agree Dirk is due for a major, but I had to look it up to make sure:
71E 2-Valve, 4-Valve, and T: New Parts 475 PSI, Minimum 425 PSI
For example, you get 475 on 5 cylinders, and 445 on 1 cylinder, you need to look at that one cylinder, and find out why it's different from the rest. If you get readings between 430-445psi on all cylinders, you're within spec, although you're getting close to needing an overhaul. |
Michael McCartney
New member
Username: mccartney813
Post Number: 1
Registered: 06-2009
| | Posted on Friday, June 12, 2009 - 10:13 am: |
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HELP!!!!
I have a 1981 Uniflite with two Detroit 671's. The starboard engine has twice pulled water through the exhaust and frozen the engine. I pulled the injectors and exhaust and got the engine to move. I am now sitting in a very small town in Alaska waiting for a mechanic. Please write or call with any suggestions. Thanks 602-432-3383 |
dirk steen
Member
Username: quite_the_ride
Post Number: 6
Registered: 05-2009
| | Posted on Friday, July 10, 2009 - 01:33 pm: |
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thanks jimmy and john, I needed more information, my customer dosen't believe after 3000 hrs he needs a major, I also contacted johnson and towers who built the engines and they told me the same thing,
thanks guys |
