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  #1  
Old 12-30-2004, 07:40 AM
jeepsnstuff jeepsnstuff is offline
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Default Timing Problems?392 or a 401?

I put a new distributor in my V8 and now it is burning up (literally) some of the plugs. I am not sure of the right firing order, as I have been told several different things. The motor says it is a 392 according to the sticcker on the valvecover drivers side. It came out of a 44 pass. 1980 school bus and has the "allison" type auto tranny behind it. Any help? or where to look for help?
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  #2  
Old 12-30-2004, 08:57 AM
Mike Huebner Mike Huebner is offline
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Default Re: Timing Problems?392 or a 401?

I would say its probably a 404 cu.
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  #3  
Old 12-30-2004, 09:24 AM
jeepsnstuff jeepsnstuff is offline
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Default Re: Timing Problems?392 or a 401?

suggested firing order?
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  #4  
Old 12-30-2004, 09:29 AM
jeff campbell jeff campbell is offline
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Default Re: Timing Problems?392 or a 401?

here ya go-1,2,7,3,4,5,6,8..all 404's & 446's...1977-1984..jeff
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Old 12-30-2004, 09:45 AM
Mike Huebner Mike Huebner is offline
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Default Re: Timing Problems?392 or a 401?

If its a 404 the firing order is 1,2,7,3,4,5,6,8 Number one is located on the passenger side of the engine 1,3,5,7 on the driver side 2,4,6,8 the engine rotates counter clockwise most were timed at 5 degrees before Number one on the distributor cap is located to the right of the distributor CLIP located toward the passenger side of the engine GOOD LUCK
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Old 12-30-2004, 10:04 AM
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Jim Grammer Jim Grammer is offline
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Default Re: Timing Problems?392 or a 401?

Quote:
Originally Posted by jeepsnstuff
I put a new distributor in my V8 and now it is burning up (literally) some of the plugs. I am not sure of the right firing order, as I have been told several different things. The motor says it is a 392 according to the sticcker on the valvecover drivers side. It came out of a 44 pass. 1980 school bus and has the "allison" type auto tranny behind it. Any help? or where to look for help?
Not sure how we got to MV(404/446) engines from your post

It certainly could be a 392, they were made until '84 and were used with Allisons. Look for the ID pad on the passengers side front corner of the block:

http://www.binderplanet.com/forums/f...cfaq_engine_id

If there is no pad at all in this location, you may have a 404. If there's no pad and it has a 2bbl carburetor, you probably do have a 404 and the info already given applies. Look at the firing order that's cast into the top surface of the intake manifold. If it matches the other info posted you *definitely* have a 404/446 . The 392(SV) and 404/446(MV) are 2 different families of engine. The appearance is quite different, and it's readily apparent once you're familiar with them. I realize that might not help you in this case tho'

If it is 392, you'll find that the firing order reads 1-8-4-3-6-5-7-2

Be sure that #5 and 7 plug wires are well separated.

Keep in mind that the drivers side bank is 1-3-5-7 front to rear(also cast on the intake), and the passenger bank is 2-4-6-8.

The 392 times off of #8.

What plugs are you running?
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Old 12-30-2004, 10:10 AM
jeff campbell jeff campbell is offline
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Default Re: Timing Problems?392 or a 401?

also on the 404's the base where the dizzy sits is bigger area than the sv's.bout the size of yur hand,an the valve covers look alot different,an the motor is wider...jeff
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Old 12-30-2004, 01:57 PM
jeepsnstuff jeepsnstuff is offline
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Default Re: Timing Problems?392 or a 401?

well, I pretty much determined it IS a 392. Took out all of the plugs and determined the correct firing order by following the pistons order of compression stroke as I turned the motor by hand. I put in all new plugs. It seem to run really well. I drove it about 25 miles, seem to be running well. Shut it off, filled it with fuel, and then when I started it, IT would not run for &#it! It burned out the #5 plug(and I mean burned out, the center electrode and insulator is GONE). #1, #2, #4 seem to have been tapped, as the gap in the plug is 0-1 thousandth , but not SMashed. Put new plugs in again, even though it seems that 3 and 5 have no, or very little, compression. Now it will run , but poorly, ?!! Take the Temp Gun and shoot the exhaust and apparently it is only firing on #'s 2,4,6,and 7? Did the timing chain jump? Burn holes in pistons or valves? If the timing chain jumped wouldn't the compresion decrease equally on all 8 cylinders?
thanks for all the help
new to IH's so it is really appreciated
I was hoping to be able to stay with IH powerplant , but am I better off to do like I did my Jeeps and switch to a Chevy Powerplant?
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  #9  
Old 12-30-2004, 02:04 PM
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IH64Scout IH64Scout is offline
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Default Re: Timing Problems?392 or a 401?

Quote:
Originally Posted by jeepsnstuff
well, I pretty much determined it IS a 392. Took out all of the plugs and determined the correct firing order by following the pistons order of compression stroke as I turned the motor by hand. I put in all new plugs. It seem to run really well. I drove it about 25 miles, seem to be running well. Shut it off, filled it with fuel, and then when I started it, IT would not run for &#it! It burned out the #5 plug(and I mean burned out, the center electrode and insulator is GONE). #1, #2, #4 seem to have been tapped, as the gap in the plug is 0-1 thousandth , but not SMashed. Put new plugs in again, even though it seems that 3 and 5 have no, or very little, compression. Now it will run , but poorly, ?!! Take the Temp Gun and shoot the exhaust and apparently it is only firing on #'s 2,4,6,and 7? Did the timing chain jump? Burn holes in pistons or valves? If the timing chain jumped wouldn't the compresion decrease equally on all 8 cylinders?
thanks for all the help
new to IH's so it is really appreciated
I was hoping to be able to stay with IH powerplant , but am I better off to do like I did my Jeeps and switch to a Chevy Powerplant?
see IH is alot better then chebby, they don't use a chain, they use gears, and unless the motor locks, the gears won't jump time.

whtever you do don't go Chebby, that's just asking for trouble!

BTW what is this 392 even in???
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  #10  
Old 12-30-2004, 02:07 PM
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BigRigg BigRigg is offline
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Default Re: Timing Problems?392 or a 401?

well one thing I can tell you for sure, its not the timing chain...International engines dont have timing chains, they have gears. This is already one reason not to switch over to chevrolet.

Edit: I see that I am slow to typing as someone has beaten me to the punch.
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