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Author Topic: 8v92T  (Read 4577 times)
jetart
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« Reply #15 on: March 16, 2014, 10:22:34 AM »

If the filters are dry it would seem plausible that air is being introduced someplace between your full fuel tank and the filters.  Mine has hard lines between the tank the the primary filter - I would suppose that if you had the same you could have a small crack or an area that has been rubbed through.  Maybe a loose fitting?  Soft lines could be rubbed through as pointed out earlier.  Good luck.
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'82 Prevost LeMirage XL, 8V71NA, 6 speed Spicer, converter unknown
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« Reply #16 on: March 16, 2014, 12:11:24 PM »

Seems put the fuel pickup line in a full 5 gal bucket would give a big clue ?
Dave M
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MCI7 20+ Yrs
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« Reply #17 on: March 16, 2014, 01:05:17 PM »

The only time i was having problems with it sucking the filters dry was prior to having the fuel tank toped off , after i topped the tank off engine took the prime and started flawlesly runs perfect now untill it hits 1500 RPM , thats why i changed the filters it runs great untill it goes over 1500 RPM
Thanks
Dave
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Hyway 3 100 klms south of Yellowknife NWT Canada
saddleup
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« Reply #18 on: March 16, 2014, 01:20:11 PM »

Is the fuel engine shutoff thingy hanging up and not leting it come back all the way,mine would do that and a had to pull it back by hand after a shut down
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Battle Mountain,NV  Molson,Wa  Yuma,Az


1974 Eagle 05 On the road, to Somewhere
Iceni John
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« Reply #19 on: March 16, 2014, 01:36:16 PM »

see if runs full power after 15000 RPM .... it is smooth as silk till hits 16000
Thanks
Dave
Yup, I had the same problem when I tried using a Formula 1 racecar engine in my bus, but when I put the Detroit back in it was OK again.

Seriously though (!), as Luvrbus suggested, put a fuel pressure gauge in the spare port on the side of the secondary filter, then it will help you narrow down where fuel-related problems may be.   I did this a while ago  -  well worth it.   When you try to run the engine over 1500 RPM, is it under load (at what turbo boost pressure?) or at no load?

John

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1990 Crown 2R-40N-552:  6V92TAC, DDEC II, HT740, Jake.      Hecho en Chino.     
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« Reply #20 on: March 16, 2014, 03:30:21 PM »

The fuel filter to the left is the primary filter correct ......  and the filter down under to your right is the secondary ... when you open the barn door correct or vise versa
Dave
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Hyway 3 100 klms south of Yellowknife NWT Canada
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« Reply #21 on: March 16, 2014, 05:29:20 PM »

Dave, look at the fuel lines. The supply line from the tank comes through the fire wall, then to the primary filter. From there, it goes to the fuel pump, then to the secondary filter, then to the heads. Then from the heads back to the fire wall and the fuel tank. The lines are under suction from the tank to the primary and to the pump, then under pressure from the pump onward.

JC
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JC
Invermere, BC
1977 MC5C, 6V92/HT740
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« Reply #22 on: March 16, 2014, 07:58:17 PM »

Ok then ill check that out
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Hyway 3 100 klms south of Yellowknife NWT Canada
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« Reply #23 on: March 16, 2014, 08:22:40 PM »

After looking closely at the muffler maybe good idea to change it   does any one have an aftermarket part # for this   rather then ordering it threw MCI
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Hyway 3 100 klms south of Yellowknife NWT Canada
TomC
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« Reply #24 on: March 16, 2014, 10:08:18 PM »

Go to the Donaldson site. There are numerous mufflers available. Just have to get one that fits with the correct fittings and flow characteristics.

I'm using a 5" inlet and outlet on the same end oval muffler that's about 20" long made for turbo engines. It puts out a nice tone with no back pressure. Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
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« Reply #25 on: March 23, 2014, 10:08:02 AM »

Tomc   you were correct it was a colapsed exhaust muffler
Thanks every one for input
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Hyway 3 100 klms south of Yellowknife NWT Canada
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« Reply #26 on: March 24, 2014, 02:59:24 PM »

Nice to hear that it is a relatively cheap repair! Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
belfert
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« Reply #27 on: March 24, 2014, 05:22:45 PM »

I don't know if you got a new muffler yet, but sometimes you can cross from an MCI part number.  I needed a new muffler for my Dina and MCI wanted over $1000.  After a lot of work I found a cross for the MCI number, but it was listed as Universal Coach Parts instead of Dina or MCI.  I paid less than $400.  (Universal Coach Parts used to be the parts division for MCI.)

I really wanted to use a different muffler, but the way everything underneath is arranged I couldn't find a way to make another muffler fit.
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Brian Elfert - 1995 Dina Viaggio 1000 Series 60/B500 - 75% done but usable - Minneapolis, MN
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« Reply #28 on: March 24, 2014, 07:17:59 PM »

I've got a brand new never installed muffler for an 8v-92 that I got from Prevost for sale cheap! Well lots cheaper than a new one!


Sent from my iPhone using Tapatalk
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Ace Rossi
Lakeland, Fl. 33810
Prevost H3-40
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« Reply #29 on: March 24, 2014, 08:49:25 PM »

Big 5" muffler should be less than $200.00. Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
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