Looks like it's that time for a HG as I have two leaks now (one on each side). Any one have pros/cons to using studs rather than the standard head bolts? D & D has a stud kit for the Rover 4.0L.
Head studs rather than head bolts?
- Thread starter Brian Dickey
- Start date
Cant get any torque to them without the threat of tearing the threads out of the block IMO. ?????
Most "costly" aluminum block engines use studs. Repeated threading and unthreading of a steel bolt into an aluminum block isn't the greatest idea. I don't think you find stretchy disposable bolts on more expensive engines either. They would lean more torwards higher grade chrome moly studs.
Most "costly" aluminum block engines use studs. Repeated threading and unthreading of a steel bolt into an aluminum block isn't the greatest idea. I don't think you find stretchy disposable bolts on more expensive engines either. They would lean more torwards higher grade chrome moly studs.
JohnB said:
Then just put the stud in question in after placing the head on. The main reason people use stretch bolts instead of studs is cost. A set of ARP studs are almost double the cost of head bolts. That and people aren't aware of the advantages of studs, or just dont feel they're worth the cost on a non-performance engine
Studs work and are available at almost the same cost as stretch bolts.
All the above excuses not to use them is bunkum.
All the above excuses not to use them is bunkum.
What's wrong with the stretch bolts? If you don't want to use stretch bolts I would just use the older style bolts and gaskets rather than studs, but that's just me.
JohnB said:
The stud manufacturer supplied the torque data and sequence on the head with the studs (D&D Fabrications). The gasket was composite.
I personally feel that the metal gaskets are better and see no reason why it could not be used with the studs. I am going to use metal gaskets and studs on the rebuild of my 4.2L.
jymmiejamz said:
There are many things I don't like about stretch bolts.
First the 15 ft/lbs + 90 + 90 is a pain in the ass.
Secondly the amount of force to get the last 90 on the bolts is not always consistant. It does not feel right to me to have one bolt require more force than the next one.
Also you can't back them up if you go too far on one by a degree or two.
You cannot reuse the bolts.
The bolts are harder to get out because they stick and then break loose instead of releasing in a consistant manner.
They don't seem to work given the outstanding results with rover head gasket failures.
ptschram
Well-known member
landrovered said:
The TTY bolts were introduced in 1995. We didn't begin to see wholesale failures until the DII. While it's not uncommon for the DIs to need headgaskets, most of the time it was due to valve guide fouling, not head gasket failures.
Don't follow ARP's torque specs, call Mark, he has the correct info.
Reviving this thread to note that ARP will make head studs for the 4.0 L Discovery 2. I haven't seen anyone else mention ARP in the head gasket threads and thought offering this info might give owners an alternate supplier.
We sent ARP the specs, they happily made the studs and 2nd day aired them to us for $200. Turn around for the custom order was under 5 days. They're in my '02 and I'm hopeful that the truck won't need gaskets again... ever.
-Peter
We sent ARP the specs, they happily made the studs and 2nd day aired them to us for $200. Turn around for the custom order was under 5 days. They're in my '02 and I'm hopeful that the truck won't need gaskets again... ever.
-Peter
ok, revising my statement, as long as you use the proper lube with the studes and nuts, they should work well. to get the rears in on a disco, thread the last two in after you set the head down and double nut the stud to tighten it to spec, then torque them down to spec. i think i will try them if i do another head job.
I know the motor is basically the same throughout its 40 whatever year existence, but are the studs specs the same for the various generations/iterations? Over the phone, ARP didn't think so.Durt D1ver said:
-P
edit: To make clear, upon asking ARP for studs for my '02 4.0 Liter, they said they didn't have them, but would make them if I sent the specs. ARP did say studs were available over the counter for the 3.5 and 3.9. Based on this and the lack of 4.0 Liter forum posts saying they'd used ARP head studs, I assumed there was a difference between the specs of studs for the difft generations of the motor. Am I wrong?
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According to D&D, they're the same studs across all rover v8's. I thought the only difference between the 3.9 and 4.0 was the intake, deletion of a distributor, going to gems.