RammaR
Well-Known Member
- Joined
- August 21, 2001
- Messages
- 199
- Reaction score
- 0
- City, State
- Franklin, TN
- Year, Model & Trim Level
- '96 XLT 4x4
I replaced the heads on my '96 4.0 OHV last February and had a real problem getting it to run. (some of you might remember this thread:http://www.explorerforum.com/forums/showthread.php?t=268590)
Turned out that if I torqued the rocker arm assembly down to 46 ft-lbs per the haynes manual, the intake valves were hanging open and it was backfiring through the intake. I backed of the pedestal torque so that I could spin the pushrods between my fingers when they were at TDC and that got her running.
The heads were a "new" (not remanufactured) aftermarket casting. It still doesn't run perfect and maybe a tad bit warm, so I'm thinking the pushrod length may be a little off still. Plus I don't know that I like leaving the rocker arm bolts at ~25 ft-lbs to get rods to remain spin-able.
I thought about going with the deltacam's package, but the new pushrods would be even longer than my current rods after their 190k miles of wear.
Any tips on how to measure what the ideal pushrod length should be? Or maybe just shim up the rocker arm pedestals a little?
Thanks.
Turned out that if I torqued the rocker arm assembly down to 46 ft-lbs per the haynes manual, the intake valves were hanging open and it was backfiring through the intake. I backed of the pedestal torque so that I could spin the pushrods between my fingers when they were at TDC and that got her running.
The heads were a "new" (not remanufactured) aftermarket casting. It still doesn't run perfect and maybe a tad bit warm, so I'm thinking the pushrod length may be a little off still. Plus I don't know that I like leaving the rocker arm bolts at ~25 ft-lbs to get rods to remain spin-able.
I thought about going with the deltacam's package, but the new pushrods would be even longer than my current rods after their 190k miles of wear.
Any tips on how to measure what the ideal pushrod length should be? Or maybe just shim up the rocker arm pedestals a little?
Thanks.