Removal of head bolts
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Thanks! For replacement (using ARP studs/nuts), should I use the 100 ft/lb recommended by ARP, or the 15 ft/lb, then 90 degrees and 90 degrees more recommended by LR?
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these dudes go 60ftlbs, that seems low
2001 Land Rover Discovery II - 4 Wheel Drive & Sport Utility Magazine
all over the place here...20 60 80 seems to be a common group and seems about right
ARP Headgasket Oil Leak - DiscoWeb Message Boards
and on and on, but the arp recommendation takes you to 100ftlbs (unless it has been updated in the last couple years.) that seems awfully high to me, but I'm no bolt/stud engineer.
I think I went 20 40 60 80 overnight 88. same principle just added a stage or 2.
yep arp still has 100...
8. Following the manufacturers recommended torque sequence tighten the nuts in three equal steps to 100 ft lbs with ARP ULTRA-TORQUE FASTENER ASSEMBLY LUBRICANT.
2001 Land Rover Discovery II - 4 Wheel Drive & Sport Utility Magazine
all over the place here...20 60 80 seems to be a common group and seems about right
ARP Headgasket Oil Leak - DiscoWeb Message Boards
and on and on, but the arp recommendation takes you to 100ftlbs (unless it has been updated in the last couple years.) that seems awfully high to me, but I'm no bolt/stud engineer.
I think I went 20 40 60 80 overnight 88. same principle just added a stage or 2.
yep arp still has 100...
8. Following the manufacturers recommended torque sequence tighten the nuts in three equal steps to 100 ft lbs with ARP ULTRA-TORQUE FASTENER ASSEMBLY LUBRICANT.
Last edited by dusty1; 12-29-2014 at 02:18 PM.
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Using ARP head bolts for some years on the Vauxhall Caterham, Ford BDA and Pajero heads. The Paj suffers the same issues as the D2 V8 with blown head gaskets albeit an alloy head to iron block but much higher compression ratio, 19.5:1. I would have thought that 'first use' threads could take much more than 90 lb/ft but problem is stretched weakened threads in well used blocks create a different scenario and also embrittlement comes into play. If it were me, I'd go for 3-4 torquing stages on an older block with the thread super lube and after 3 button it up and run the engine up to temp and then a final re-tighten to say 90 lb/ft once cooled down. Alternatively, as Dusty states, let the bolts stretch some overnight and do a final tighten which saves refitting all the rocker covers and intake tat and then stripping it all off again then refitting it all back - tedious or what?
I hate head bolt threaded into alu blocks in any case 'cos they always frick up sooner or later
Source some helicoils or inserts just in case.
I hate head bolt threaded into alu blocks in any case 'cos they always frick up sooner or later
Source some helicoils or inserts just in case.