Headbolts

[Russleh]

as above. when my bottom end is built ill need to swap the head off my other engine onto it so is swapping the headbolts essensial when doing this ?

thanks

Russell

[ktl]

always replace headbolts when they are removed. there only 40bucks.

[Russleh]

40 quid ontop of everythin else i have to buy is alot but i suppose ill have too lol

[ktl]

think about it dude, you rebuild your engine with brand new bits and leave out the headbolts. you drive the car around and find out that the headbolts are not doing there job due to being weak. another new headgasket, and more hours for you sir lol.

its annoying paying out more then you want to but it will save you money in the long run.

[riko666]

they HAVE to be replaced - they're torqued to yield, i.e. they're actually torqued to the point of being stretched slightly, so don't take the chance

[Russleh]

ill be buying them then lol.

[ray0098]

wot tool do u need to do them up i was told a 9mm spline key is that right and where can i get one from

[ollie ryan]

do arp uprated ones have to be replaced or can you re use them too?

[Dan Evans]

you can re-use head bolts, I've just re-used mine but they were only in for like 600miles.

Autodata will tell you that they do NOT need to be replaced.

as above if there that bad then yeah

[GAZ@A&G_TUNING]

anwser is NO, but what sort of build are ya doing, the ARP are crap, we have snapped to of them putting them in!!!!, not even to the max torque setting!!!!!!!!

[Dan Evans]

I thought ARP bolts were stronger Gaz?

[Dave@TM-Developments.com]

ARP bolts are fine if fitted properly. We have used many sets with no problems whatsoever

[GAZ@A&G_TUNING]

whats the special way to fit them then dave? pretty basic stuff, and when you can undo the broken part with your hand you do have to wonder!!!!!!!!

4age head stud it mate if your after proper big power mate

[Dave@TM-Developments.com]

These were fitted by you?? Perhaps you can explain why you shouldn't be able to undo the broken part by hand. In your own words gaz, pretty basic stuff but you seemed to have completely missed your own point

[GTS GAV]

I gota say i was pritty sapprised when gaz told me about the arp head bolt issue, arp studs and bolts in genral especialy the lp19 are imo the best money can buy.

I spoken to many owners of various companys i deal with tim at tb abbey, andy at serious, adrian at fens, no one has ever had one break on them, I've used them on my build with intedid boost pressures of 2.5bar+ and have full faith in them

just thort id add arp's are also fine to re use unless there like the pic above

maybe a silly question gaz as im sure you did, but did you torque the head up then put it through a head cycle then loosen an then re tighten?

[Dan Evans]

y would you loosen then re-tighten?

auto part says use 22nm then 44nm the a 90degree on each

[GTS GAV]

just what i have always been told to do buy adrian on arp's, i think it was something along the lines of it helps them to settle/seat properly

ARP say this in there instructions also, "The studs need to be lubed at the block end as well, tightened hand tight. torque them to spec, loosen them by sequence, an re-torque before use"

"Then after 10 heat cycles you retorque them again. This is when the engine comes up to full heat, then cools down again. 10x like that. You dont loosen then tighten as done when first fitted, you just torque them down more. You'll find that they back off around 5-10ft-lbs"

[Dan Evans]

oh right, never new that, does the same have to be done with standard aswell or not?

[GTS GAV]

oh right, never new that, does the same have to be done with standard aswell or not?

no not usualy but just deppends on personal prefrence

[Cali-BHC]

I'm replacing my cylinder head hopefully at the weekend, what is the correct tourque setting for the head bolts?

[RobSR]

ARP bolts are fine if fitted properly. We have used many sets with no problems whatsoever

Thought as much LOL

[GAZ@A&G_TUNING]

yeah we need to spend a few more hour's reserching on google so we can understand how these bolt's go in right!!!!

[micky boy]

@ gaz

[Danturbo4311]

ARP bolts dont have the same torque settings as stock bolts, from memory they are to be tightened in 3 stages equally upto 60ftlbs with ARP lube, I have heard of others having problems with them when fitting, but mine were fine, GTS GAV I no its not what you ment but just to make it clear to other people, dont go loosening off your headbolts, as once theyve been torqued the headgasket has crushed/sealed so last thing you wanna do is cause problems. Also I understand what your saying about retorquing them after a few cycles but I've tried that on stock botls & they didnt tighten anymore, plus it was a bit of hassle as the cams have to come back out again to get the 2 bolts under the cam gears.

[Asad]

Dont think i`d ever loosen them tbh....dont think toyota would have had the time to do so either, 14yrs on and its still fine lol