If one does that, does one need to change to the later torque to yield head bolts?Quote:
Originally Posted by Blknight.aus
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If one does that, does one need to change to the later torque to yield head bolts?Quote:
Originally Posted by Blknight.aus
yep, but when you order up the bolts if you specify you want the bolts for a 10 bolt head you should get the torque to yield bolts.
But one could continue to use original bolts and torque settings with minimal torque on the outer four?
Am I missing something? Aren't the outer 4 bolt holes missing in the 10 bolt head? Use the 14 bolt bolts/tightening sequence but leave off the 4 outers?
no, not unless you were willing to drill out your 10 bolt heads with the extra 4 bolt holes for the outer row of bolts.Quote:
Originally Posted by p38arover
you could reuse the original 10 non yield bolts from a 14 bolt head in the 10 bolt head and then go for the nominal torques for a 10 bolt pattern but I would advise against this as I'm not sure how the old style bolts would react to the extra tension.
if you wanted to do a 14 bolt head as other than specified my advise would be to obtain a 14 bolt head gasket 10 of the new bolts and keep the outer row of 4 bolts. Tighten all bolts to the initial stage of torquing as per the 10 bolt method but use the 14 bolt pattern then on the next pass of the 10 bolt method using 14 bolt pattern the 4 bolts of the outer row only recieve 1/8th-1/4 of a turn as opposed to 1/2, just enough to maintain the initial torque setting of the 4 bolts. then Same same for the final pass.
My biggest concern with the method that you are hinting at is that it may not maintain even clamping on the 14 bolt gasket.
the P76 4.4 litre engine never had the 4 outer bolts, I have one here with 420 000km since the heads came off, still going fine. Standard bolts as per Rover. IMO the 10 bolt heads should be OK unless you cook it, then all bets are off.Quote:
Originally Posted by Blknight.aus
if you have the 10 bolt heads already then it should have the appropriate torque to yield bolts in it. ( or have I miss read that and you mean you have a 10 bolt with the old style non yield bolts in it?)
as far as Im aware theres only 2 different techniques in the book and thats the 14 bolt one which is the old in sequence in stages to tension X and the 10 bolt one which is in sequence to torque x then +90 degrees in sequence by 2.
Thanks to P38arover's PDF earlier on this post the sequence for the 10 bolt and 14 bolt heads is the same, apart from doing the outer 4 bolts last of all. The P76 10 bolt heads use standard non-yield bolts, should be the same for a newer 10 bolt head using non-yield bolts.
Yes, and one also needs to use 10 bolt composite gaskets as the late heads have a thicker headface than the early heads.Quote:
Originally Posted by p38arover
Steel laminate gaskets will increase the rocker clearance and one can end up with a lot of tap tap tapping!
Cheers
Andrew