6 or 8 bolts crankshaft

[gerko]

I got an Explorer from 1991 and the crankshaft has 6 bolts at the flywheel.

which years or more preferable which motorcodes has 8 bolts?
Because I really want a new engine with the 6 bolts crankshaft!!

Thanks in advance

 

[mjonesjr]

Any mid-'97 and earlier Ranger or Explorer had the 6 bolt flywheel.

 

[swynx]

this is out of relevance and is a bit odd, but when i did the swap on my 4.0, the 91 4.0 i took out had 6 bolts on the fly wheel, the 4.0 i took out of an 93 explorer had 7 or 8, i remember this because i had to go buy a resurfaced flywheel. which i wasnt counting on because the old flywheel was in great condition.

 

[mjonesjr]

Ford started using the 8 bolt in mid year of '97. My '97 Ranger had the 6 bolt flywheel. My mom's '97 Explorer has the 6 bolt flywheel as well.

 

[Ranger44]

Those 7th & 8th bolt holes would have been the 2 holes for a puller.

 

[mjonesjr]

Those 7th & 8th bolt holes would have been the 2 holes for a puller.

You don't have to use a puller on the flywheel. If you remove the bolts, it will fall off.

 

[AllanD]

there are "puller holes" on a 3.0, but not a 4.0.

The 8-bolt flywheel was to allow Ford to make ONE rotatig parts
Set for the upcomming (at the time) 4.0SOHC.

If you encounter an 8-bolt flywheel on a 4.0 engine in a truck
earlier than a late production 1997 then the explanation is simple,
the engine you are looking at isn't original to the vehicle you are looking at...

AD

 

[mjonesjr]

If you encounter an 8-bolt flywheel on a 4.0 engine in a truck
earlier than a late production 1997 then the explanation is simple,
the engine you are looking at isn't original to the vehicle you are looking at...

AD

Or the crank shaft could have been replaced with a newer 4.0 engine crank shaft.

 

[gerko]

Thanks for your answers

It is important for me because I fit a gearbox en flywheel
from the 2.8/2.9 engines to my 4.0 V6.

 

[AllanD]

Or the crank shaft could have been replaced with a newer 4.0 engine crank shaft.

NOT without replacing the ENTIRE reciprocating assembly.

The 8bolt crank is refered to as the "lightweight rotating assembly"
and CANNOT be balanced with the earlier (heavier) pistons and rods

The point of changing things was because the crank was also to be used in the revvier 4.0SOHC.

Thanks for your answers

It is important for me because I fit a gearbox en flywheel
from the 2.8/2.9 engines to my 4.0 V6.

Don't do it.

The 4.0 MUST HAVE the heavier flywheel or it'll shake the trans to pieces from torsional shock, but frankly it'll probably do that to the 2.9 trans anyway

and the larger clutch is simply necissary for the bigger engine.

AD

 

[DPDISXR4Ti]

Lots of references (including this thread) indicate that the 4L Cologne V6 started getting the 8-bolt crank in mid to late 1997 in the Ranger and Explorer. I've yet to find any mention of when the Aerostar got the 8-bolt crank. Logically, it doesn't make sense that it would have gotten rolled out just as Aerostar production ended in 1997, but weirder things have happened. Anyone know for sure? Better yet, is there any way to ID a long-block with the 8-bolt crank while the transmission is still attached? (i.e. in the junkyard)