I Still Need A G501 Bolt (Page 1/5)
Carlin SEP 10, 12:56 AM


So I got this image from Vintage Nut but still need help. I know people have said that the size is M11x1.5 but I'm missing the depth. That or if anyone knows where to find this single bolt. The only thing I can think of is if I get lucky and find a guy parting out a Fiero online. Some guy on here said that I shouldn't start it unless I get this bolt so I don't ruin my engine. I have also looked online but there is basically nothing.
1985 Fiero GT SEP 10, 06:17 AM

quote
Originally posted by Carlin:



So I got this image from Vintage Nut but still need help. I know people have said that the size is M11x1.5 but I'm missing the depth. That or if anyone knows where to find this single bolt. The only thing I can think of is if I get lucky and find a guy parting out a Fiero online. Some guy on here said that I shouldn't start it unless I get this bolt so I don't ruin my engine. I have also looked online but there is basically nothing.



It is a head bolt, it is a rare thread size and a special hardness or whatever, so you'll need to get a specific set of head bolts, ask your stores or look up the head bolts, I don't think you'll find them individually. a set will have the one head stud and I think 15 head bolts, then you can look and verify that the other head bolts are in the engine or not (at least the visible ones). All the head bolts are what keeps the top of the combustion chamber (the head) on the engine, no bolts or missing ones, then the explosions in the engine can lift the head up a bit, blow out your head gasket, and start melting things.
Dennis LaGrua SEP 10, 08:50 AM
I will look in my bolt assortment to see if I can find this unusual bolt. Can't promise anything right now but will check later today. If we have it I'll send it but first need to find it.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

Vintage-Nut SEP 10, 09:07 AM
FYI
As mentioned, the G501 image is found in the V6 Cylinder Head Bolt Set...


Normally, both cylinder heads are removed and reinstalled on the engine block as a 'set' when servicing the heads AND these bolts are NOT reusable!

Once the heads are 'torqued' to spec, the bolts have been 'stretched' so "One Use" ONLY.

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Original Owner of a Silver '88 GT
Under 'Production Refurbishment' @ 136k Miles

1985 Fiero GT SEP 10, 09:44 AM

quote
Originally posted by Vintage-Nut:

FYI
As mentioned, the G501 image is found in the V6 Cylinder Head Bolt Set...


Normally, both cylinder heads are removed and reinstalled on the engine block as a 'set' when servicing the heads AND these bolts are NOT reusable!

Once the heads are 'torqued' to spec, the bolts have been 'stretched' so "One Use" ONLY.




Most new vehicle head bolts are torque to yield, however Fieros aren't, the manual specifies only a torque, not a torque and angle for torque to yield bolts (the felt torque decreases as a bolt yields, therefore only a torque spec would either never be reached before the bolt snaps or is before the point where the bolt starts to deform and stretch) and specifies to clean and reuse them. As long as it is torqued to the factory manual spec (66 foot pounds if I remember, definitely not the 90 foot pounds of some of the aftermarket manuals) and a used bolt is clean and in good shape, they'll be fine. I've driven 15000kms total on a set of head bolts that were used twice, then later, a 3rd time on another engine. No issues.
Vintage-Nut SEP 10, 10:09 AM

quote
Pontiac Fiero 2.8L V6 cylinder head bolts are not the torque‑to‑yield type


Thanks for the correction...
In rebuilding my engines; I always buy new bolts....
Carlin SEP 10, 03:49 PM

quote
Originally posted by Dennis LaGrua:

I will look in my bolt assortment to see if I can find this unusual bolt. Can't promise anything right now but will check later today. If we have it I'll send it but first need to find it.




ok let me know if you get lucky and find one. I still don't know why the bolt is even missing. The previous guy was trying to do something with the negative battery cable because it wasn't even connected.
Carlin SEP 10, 03:52 PM

quote
Originally posted by 1985 Fiero GT:


It is a head bolt, it is a rare thread size and a special hardness or whatever, so you'll need to get a specific set of head bolts, ask your stores or look up the head bolts, I don't think you'll find them individually. a set will have the one head stud and I think 15 head bolts, then you can look and verify that the other head bolts are in the engine or not (at least the visible ones). All the head bolts are what keeps the top of the combustion chamber (the head) on the engine, no bolts or missing ones, then the explosions in the engine can lift the head up a bit, blow out your head gasket, and start melting things.



I can try talking to NAPA again. last time I went I showed the bolt photo and said the engine type. They said they can't find it that way and need the bolt its self because that's how their system works I guess. Or if I was able to get the threads and other measurements.
1985 Fiero GT SEP 10, 03:55 PM

quote
Originally posted by Carlin:


I can try talking to NAPA again. last time I went I showed the bolt photo and said the engine type. They said they can't find it that way and need the bolt its self because that's how their system works I guess. Or if I was able to get the threads and other measurements.



Yeah because there are dozens of different types of bolts on the engine, if all you come with is an electrical location point and a picture, but by saying "head bolt set" that narrows it down to one specific bolt/stud type.
Carlin SEP 10, 03:58 PM

quote
Originally posted by 1985 Fiero GT:


Yeah because there are dozens of different types of bolts on the engine, if all you come with is an electrical location point and a picture, but by saying "head bolt set" that narrows it down to one specific bolt/stud type.



I told them is was G501. I thought that was enough