A rule of thumb is that they may be reused twice i. When in doubt about the history of the bolts they should be replaced. That was the policy around the dyno lab.
Fellas' I ordered the "ARP" kit that includes only head and main studs. Rod bolts were ordered through my machine shop. Best wishes, Fabricator. When you say "late model" - is there a cutoff? Like I said "never had a problem Oh, the good old days Are the old bolts "better" worth hanging on to? I'm assuming seat is in decent condition.
Contact cylinder head shop and see what they want to do about it. Leaning towards option 1 just to get this car out of here. Will still contact cylinder head shop and see what they think about sending me the wrong cam installed in the heads. I'd go with choice 1 and be done with it. Sounds like a PITA. I took a look at the parts stores and I cannot get valves on a Sunday so option 1 is likely out. I went ahead and sent an email to the cylinder head shop to see how they'd like to proceed.
I think my preference is they take their parts back and I'll find someone else with the parts. There's a large cylinder head shop here in town that I've used in the past but they were slightly more expensive in this instance I guess I understand why now and I was trying to do this as cheaply as possible again it's a k mile mitsubishi. Thanks for all the help. But it's definitely been a fun one. Working on cars is supposed to be my relaxing time.
I am currently rebuilding a Mitsubishi 6G74 3. Virtually the same engine. Previously the engine had a head gasket repair and that mechanic did not replace the head bolts. We got about 40k miles out of the head gasket repair when the engine spun the bearings.
For a few months prior to bearing failure, the engine had begun to use coolant so I suspect the head gasket had failed again. I attribute the failed bearings to coolant in the oil but no firm evidence. I was concerned on the torque to spec then relax sequence on the head bolts affecting the head gasket sealing and had called Fel-Pro help line and they confirmed the sequence had no effect on the gasket and recommended I follow the manual.
I would have tossed the bolts and reused the head gasket. The bolts are done if they are actually TTY once they've been stretched but the head gasket is ok until you run it through a heat cycle.
To each their own. Not all head bolts are TTY. And what many do not understand is a manufacturers torque spec as well as thier sequence values are directly correlated to the stock gasket and its crush characteristics. Some but not all aftermarket gaskets crush differently so torquing a aftermarket gasket using the manufactures procedures can and will cause them to leak in some cases.
Cometic is a fine example of that argument. They will crush more then stock. So you need to change up your technique when installing them. Joined Apr 17, Messages 2, Location Massachusetts. Definitely replace since they are TTY.
I would also use a new head gasket no matter what Felpro says. It just isn't worth it to me to reuse the gasket. Schurkey Well-known member. The head rebuilder is at fault for all of this, as long as they shipped with the wrong camshaft. Tell the head rebuilder to buy bolts and gasket if you're not comfortable with re-use. Fixing their screwup is not something that should cost you extra. Those aren't TTY bolts. I also would not call them "pre-stretched". Any gasket that comes apart during dis-assembly would be reinstalled Thin-stemmed valves I bet they're bent.
Go too far, of course, and the bolt breaks. For a hundred years, head bolts were used like any other fastener, in the elastic range. They could be torqued, untorqued and re-used indefinitely. For the last twenty years, however, the switch to torque-to-yield head bolts made them disposable parts.
There are several reasons. A major one is the move to light alloy block castings which have become thinner and thinner with each engine redesign. Distortion due to uneven clamp loads is a real hazard if heads are installed carelessly. Another reason is increased bolt length.
Modern OHC head designs are taller, and bolts have to reach down below thin block decks and grab more substantial metal lower in the crankcase. Longer bolts act like torsion bars, with lots of spring well below proper clamp loading. Can you use stretch bolts again?
Stretch or TTY bolts are exclusively angle torqued. There is no means by which bolt stretch at the yield point can be controlled by torque alone. Again, if they are not angle torqued you probably don't need to replace them. Just apply your own sealer or threadlocker and reuse them. Can you reuse Honda Civic head bolts? No do not reuse them. Just because other people have done this and had no problems doesn't mean you should! Most head bolts are torque to yeld bolts.
That means that after they are used once to replace them. How do I know if my head bolts are torque to yield? The torque-to-yield procedure stretches the bolts into their elastic range. Can I reuse ARP head bolts?
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