6.9/7.3
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
Same motor, only difference is the bore.
Some of the externals like glow plug system and serpentine belts were changed from year to year. The 93 and 94 turbo model had bigger wrist pins in the pistons. Some of the early 6.9's had weaker blocks that were corrected in 85 as I remember.
Everything that will bolt on an 83 6.9 will bolt on a 94 7.3 turbo, this works the other way as well.
Some of the externals like glow plug system and serpentine belts were changed from year to year. The 93 and 94 turbo model had bigger wrist pins in the pistons. Some of the early 6.9's had weaker blocks that were corrected in 85 as I remember.
Everything that will bolt on an 83 6.9 will bolt on a 94 7.3 turbo, this works the other way as well.
Posting Guru
Joined: Jul 2003
Posts: 1,028
Likes: 1
From: San Antonio
6.9s are better than 7.3 only because the big C (cavitation) will hit the 7.3 first and 7.3s also drop valves(they screwed up trying to fix the oil problem. early 6.9 are only effected if you plug in the block heater other wise they are good too. 6.9 have a better chance of blowing head gaskets but thats it.
Elder User
Joined: Oct 2002
Posts: 743
Likes: 1
I happen to like the 6.9 better for the economy reasons and they tend to be just as, if not more durable than the 7.3. The head-gaskets seem to only be a problem on high mileage ones, or turbo'd engines. Honestly I don't think the extra cost/power of the 7.3 is worth the trouble with the cavitation issues they have.
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Senior User
Joined: Mar 2005
Posts: 117
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Originally Posted by trike1946
Have you considered the suspension with the extra weight?
as far as getting the fuel from the tanks to the engine, how does this work? does the injector pump bring the fuel from the tank or does it have pumps it the tanks?
what is the bore on a 6.9 and 7.3?
will my current ZF tranny work on the diesel bellhousing?
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Infidel
Joined: Aug 2003
Posts: 1,115
Likes: 2
From: Elkhorn WI
You need to get a tank for diesel, there coated inside and out other wise your gasoline tank might have problems. So i hear.
Gas and diesel bellhousings are different and since the bellhousing of a ZF tranny is intergraded/not interchangable you have to find a ZF with a diesel bellhousing.
Gas and diesel bellhousings are different and since the bellhousing of a ZF tranny is intergraded/not interchangable you have to find a ZF with a diesel bellhousing.
Last edited by Fordbronco69; Apr 25, 2005 at 07:06 PM.
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Logistics Pro
Joined: Apr 2004
Posts: 4,292
Likes: 5
From: NJ where fun comes to die
The diesels do not have a pump in the tank. Along with the injector pump there is a mechanical fuel pump (lift pump) on the engine. Some people change these to electric. There is a line from the tank and a return to the tank. If you have two tanks there is a switch on the dash and a valve under the truck on the frame rail under the driver's side.
Senior User
Joined: Dec 2004
Posts: 100
Likes: 0
From: northern new england
Read the current thread about swapping gas for diesel before you go yanking things out of your gasser. You could probably sell it and get a diesel for about the same $$$ without the hassles associated w/ swap.
Logistics Pro
Joined: Apr 2005
Posts: 4,221
Likes: 17
My old truck has the 6.9 in it. It has 300,000 miles and is still going strong. Some claim the 6.9 has high oil consumption, but to me a quart ever 500 miles or so isn't "high oil consumption".
I recently bought a '92 with the 7.3 and from what I've been hearing about these engines it sounds like the 6.9 is the better one. The cavitation isn't such a serious issue and the 'fix' Ford used on the oil consumption for the 7.3 sounds like bad news;
And I don't really notice any power difference between the two trucks.
I recently bought a '92 with the 7.3 and from what I've been hearing about these engines it sounds like the 6.9 is the better one. The cavitation isn't such a serious issue and the 'fix' Ford used on the oil consumption for the 7.3 sounds like bad news;
And I don't really notice any power difference between the two trucks.
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