4A-G con-rod bolts - strech or torque?

[Apolan]

Im reuilding the bottom end..

my crank-bearings are loud as hell.. so im wonderig do i have to replace the bolts as well? are they strech or normal bolts, can they be reused? what els do i have to replace, other than grinding/polsihing the crakshaft, new bearings and gasket?

[apardal]

Crank bearings don't tend to get worn out easily I guess!

Rod bearings do, and the bolts are never to be reused (read Bill Sherwood's page)! Don't know about crank bolts...


Best regards

[Apolan]

Tnx for the info.

Se ya!

[Ivan141]

I would get some ARP bolts or just toyota OEM rod&crank bolts. These bolts are the nr.1 cause of catastrophic engine failure at high rpm...If they break you will have holes in your engine..

[Apolan]

So do i have to buy just new rod bolts, or the other "main bearing" bolts also (the ones that go into the bottom of the engine block?)

btw.. does 4ag hae a solid iron block w/ no sleeves, or does it have sleeves?

[Ivan141]

You got it correctly...cast iron, no sleeves. I dunno about the main bearing bolts though. The rodbolts take most of the stress as far as I know, but I dont know if the main bearing bolts allow re-use. Maybe the factoy manual has something to say on the subject? Otherwise you could try to pm Billzilla, he know's these things very well.

[BenR]

Run some ARM mains abd rod bolts, for the money the security is well worth it.

Rod bolts you should ALWAYS measure using a stretch gauge, torque has far too many variable which alter readings.

Mains you cannot measure stretch, but make sure your torque gauge is very very accurate, a good beam or dial type.

Check the crank first, it might not need grinding, just a very very light polish, then you wont need to go oversize on the bearings.