Head Bolts,Replace or Not?

[streetrebeltsi]

So I just rebuilt my engine 3 days ago. Make a long story short I didn't buy a new timing belt tensioner . You can guess what happened. I just ordered a new head and timing belt kit and was wondering if I could use the New head bolts I put in 3 days ago with the rebuild? They are new OEM Bolts. Reason why I'm asking is cause I'm running low on cash.

 

[dsmpat95]

They are torque to yield bolts, so you should replace them.

 

[BogusSVO]

It is commonly accepted that the 12mm 1g/6bolt head bolts can be reused after checked for stretch.

Who did you get the head from? Have pics of it?

 

[gsexxx]

Depending on their condition you might be able to get away with reusing them. Obviously it would be a better idea to replace them. While you are in there I would highly recommended throwing in some arp's so you don't have to worry about it down the road.

 

[Petergeralis]

Any torque to yield should be replaced any time they are fastened and go through heat cycle. I know it sounds expensive but cheaper then pulling the head off again! Remember this isn't an n/a grocery getter.

 

[BogusSVO]

Yes TTY bolt are pull once and trash, The 7bolt 11mm head bolt is a TTY, with a TTY torque spec. w/ a degree pull, common to most all TTY style bolts I have come across

The 6bolt with 12mm head bolts, is old school, just a torque spec, no degree pull to them.

 

[streetrebeltsi]

Thanks Guys for the Input I was away from my cpu not long after I posted all day till now and since they are 3 days old I would love to reuse them but it comes down to cash plain and simple and since I just rebuilt everything except the tensioner and now I'm rebuilding the top half again 3 days later funds are low. I got another 700 in parts I just ordered reman. head, gates timing belt kit, water pump , v.c. gasket, head gasket, timing belt tensioner and maybe head bolts along with other small stuff. If I have the loot I'm a grab em but if I don't I cant. But arp's are definitely the next buck I'm spending. Keep em Redlining.

Oh Yea How do you check for stretch?

 

[19Eclipse90]

Oh Yea How do you check for stretch?

Measure the length of the shank and compare to the original spec (below).

6-bolt: 84mm
7-bolt: 97mm

 

[iceman510]

Please listen to what Bogus said, and stop spreading the false information that 1g 6 bolt head bolts are TTY. They are not. That started with the 7 bolt designs. Check the service manual(s).

 

[4gfun]

Measure the length of the shank and compare to the original spec (below).

6-bolt: 84mm
7-bolt: 97mm

I thought that there was a broader range than that for re-use? I can't remember where I read that. Maybe my FSM? I am reusing mine for sure since they met whatever criteria I read. They most certainly are not TTY.

 

[tharrison365]

replace them with apr

 

[19Eclipse90]

I thought that there was a broader range than that for re-use? I can't remember where I read that. Maybe my FSM? I am reusing mine for sure since they met whatever criteria I read. They most certainly are not TTY.

I don't recall ever seeing a range for 6-bolts head bolts: http://www.dsmtuners.com/forums/newbie-forum/384978-stock-6-bolt-head-studs-strength.html#post152366301.

 

[4gfun]

I don't recall ever seeing a range for 6-bolts head bolts: http://www.dsmtuners.com/forums/newbie-forum/384978-stock-6-bolt-head-studs-strength.html#post152366301.

Thanks, I recall reading it either in another thread or in a FSM. Perhaps I got my information confused with 7 bolt specs. If that is the case, you have saved me a real headache my friend!