hpdi torque question

[oceansco]

Can anyone help me I have a question about the torque spec. on my 2004 150HP HPDI. The connecting rods torque spec. reads
1st 19NM
2nd 37NM
3rd * (loosen)
4th 19NM
5th 37NM

I get the two step tightening but what is loosen and then 4th and 5th.

Thanks
John

[boats.net]

It's a stretch torque to actually stretch the bolts. You torque to specs, loosen bolts and re-torque to specs.

[oceansco]

Thanks, I have done angular and measured. This one is new and I would not have gone for the loosen, so thanks.

John

[Rob Welman]

Do you follow that procedure even if you using the old rods/caps & bolts

A Question.

Any body ever had the bearing cap split (aftermarket rod) whist going to
from 19 - 37 NM. I bought a new rod and it split along the bolt whilst taking it to 37 NM.

Rgds

Rob

[boats.net]

Do you follow that procedure even if you using the old rods/caps & bolts

A Question.

Any body ever had the bearing cap split (aftermarket rod) whist going to
from 19 - 37 NM. I bought a new rod and it split along the bolt whilst taking it to 37 NM.

Rgds

Rob

Should always use new rod bolts.
No haven't had any rod caps break, make sure it's correct rod, rod bearings and rod caps are assembled correctly. Hand tighten rod bolt rods and recheck rod cap alignment before torquing down bolts.