4.0 OHV engine experts please help - quick question about connecting rod torque
#1
4.0 OHV engine experts please help - quick question about connecting rod torque
I have a 2000 Explorer with the 4.0 OHV. My Ford factory service manual lists two different torques for the connecting rod nuts. In one spot it says 18-24 lb/ft. In another spot in the same manual it says to torque in two steps 15 lb-ft then torque an additional 90 degrees. Does anyone know what is right? Is one based on whether the bolts are new? If its the two step process do I need to replace the bolts like the head bolts? I don't want to get this wrong and have a rod cap break or come loose.
Thanks,
Jim
Thanks,
Jim
#2
The the last two OHV 4.0s I was into I did not replace the rod bolts. I torqued em down to 25 ft lbs and called it good, haven't had a problem yet... that engine has over 12k on the rebuild with no problems yet. That's in the ol lady's 90 Ranger, she drives at least 40 miles a day... not to mention she does get a bit rowdy with it from time to time.
John
John
#3
Thanks for the quick reply. I checked my Haynes manual and it too offers the same two different torque setting. However in this manual it says the 18-24 lb/ft torque is for the earlier 4.0 OHV (I think 90-96) and the later engines have this two step torque process.
I just don't know what is the correct torque for a 2000 4.0 OHV. Has anyone done a later model OHV?
Jim
I just don't know what is the correct torque for a 2000 4.0 OHV. Has anyone done a later model OHV?
Jim
#4
You might try consulting with your local Ford garage, otherwise I think you can download the info you need from Mitchell auto repair manuals (they seem to be the most accurate to the factory specs). If I had to guess I would say you have to go by the 2nd torque sequence you mentioned. As for replacing the rod bolts, when in doubt do it anyway... concider the alternative.
#5
#7
I just pulled up the "Connecting Rod" section in the Ford factory service manual for the 2000 pushrod engine. The factory torque is listed as the following:
Install the nuts and tighten in two steps.
When I pulled up the same section in the Ford factory service manual for the 1996 4.0L engine, the torque spec is the single "Tighten the nuts to 25-32 Nm (18-24 lb-ft)" statement so I suspect the comment above about the difference being dependent upon model year is accurate.
-Rod
Install the nuts and tighten in two steps.
- Tighten to 20 Nm (15 lb-ft).
- Tighten an additional 90 degrees.
When I pulled up the same section in the Ford factory service manual for the 1996 4.0L engine, the torque spec is the single "Tighten the nuts to 25-32 Nm (18-24 lb-ft)" statement so I suspect the comment above about the difference being dependent upon model year is accurate.
-Rod
Trending Topics
#8
rod torque
I know this is an old thread, but if anyone is still around what is the "book" saying for the '98 4.0 OHV (pushrod) engine? I was advised (by machine shop) to replace the bolts and do the two torque method. The problem is Ford does not have these bolts available and so far haven't found anywhere. Can the old bolts be used in the two torque method, or what is advised? Thanks.
<<I just pulled up the "Connecting Rod" section in the Ford factory service manual for the 2000 pushrod engine. The factory torque is listed as the following:
Install the nuts and tighten in two steps.
When I pulled up the same section in the Ford factory service manual for the 1996 4.0L engine, the torque spec is the single "Tighten the nuts to 25-32 Nm (18-24 lb-ft)" statement so I suspect the comment above about the difference being dependent upon model year is accurate.>>
<<I just pulled up the "Connecting Rod" section in the Ford factory service manual for the 2000 pushrod engine. The factory torque is listed as the following:
Install the nuts and tighten in two steps.
- Tighten to 20 Nm (15 lb-ft).
- Tighten an additional 90 degrees.
When I pulled up the same section in the Ford factory service manual for the 1996 4.0L engine, the torque spec is the single "Tighten the nuts to 25-32 Nm (18-24 lb-ft)" statement so I suspect the comment above about the difference being dependent upon model year is accurate.>>
Thread
Thread Starter
Forum
Replies
Last Post
eman92082
1948 - 1956 F1, F100 & Larger F-Series Trucks
12
09-14-2017 12:02 PM
stewmanc
Explorer, Sport Trac, Mountaineer & Aviator
2
03-16-2017 07:22 AM
FORDF250HDXLT
1987 - 1996 F150 & Larger F-Series Trucks
15
01-01-2017 03:50 PM