06-12-2017, 11:09 AM | #1 |
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Guide pins
any one ever install head guide pins in the block so the head does not move around after setting it on??
Seems to me that it just moves around to much tell torqued in place,which makes me wonder that it can also move a little after being torqued Tinkirk/Terry |
06-12-2017, 11:32 AM | #2 |
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Re: Guide pins
The head constantly moves during heating and cooling cycles. No guide pins necessary.
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06-12-2017, 11:54 AM | #3 |
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Re: Guide pins
Some flathead V8 engine builders drill the head and block for dowel pins. I do not think it would benefit the Model A unless you had a racing engine with valves and pistons close to the chambers.
John |
06-12-2017, 12:09 PM | #4 |
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Re: Guide pins
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06-12-2017, 12:24 PM | #5 |
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Re: Guide pins
If you do this, after figuring out where best position is you need to make some sort of permanent jig for the actual drilling so if you replace gasket, head, or block you can carry on without going mad. I don't think there are any places on deck that could take a concentric dowel around a stud.
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06-12-2017, 12:34 PM | #6 |
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Re: Guide pins
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FWIW on head movement: Ever since Model T days, vintage mechanics in the know, (from vast experiences), applied "Permatex No. 2", (non-hardening gasket sealer), on both sides of head gaskets to seal same. When torquing a head and when squeezing a gasket, head gasket can move sideways; also, when engine is warm while running vs. when cold, cast iron head and block expands and contracts, (moves), but, differently from the expansion & contraction of a different metal like a copper lined head gasket also moving sideways. Non-moving hardened gasket sealer provided in moving joints can crack when used with metals having differential expansion and contraction. New silicon gaskets manufacturers recommend no gasket sealer ...... Do they want to sell lots of failed gaskets? Have no idea. I still used "Permatex No. 2" on my new silicone gasket with no re-torquing, and no leaks in 10 years. |
06-12-2017, 12:39 PM | #7 |
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Re: Guide pins
T T, I have found most gasket seepage is due to a warped head. Have you checked head and block for flat? I usually have the head checked and skimmed when it is removed.
John |
06-12-2017, 12:49 PM | #8 | |
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Re: Guide pins
Quote:
on the 29 i'm playing with now i went with bigger int.valves and i have a couple that are a little close,I don't believe it's enough to matter but was wondering about guide pins to hopefully maybe to stop the head from moving the little bit that it does move! always thinking of different ways to make thing better if possible T/T |
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06-12-2017, 01:08 PM | #9 | |
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Re: Guide pins
Quote:
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06-12-2017, 01:09 PM | #10 |
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Re: Guide pins
Cast Iron Block and Head will move but not much. Cast Iron block and Aluminum head will move around much more.
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06-12-2017, 01:27 PM | #11 |
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Re: Guide pins
Per reply #9, if anyone wants to try a few Model A guide pins, a guide pin located in a thin cast iron part of a Model A water jacket in either the head or the block ? ...... just guess at "The Rest of the Story."
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06-12-2017, 02:05 PM | #12 |
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Re: Guide pins
I drill the head holes slightly oversize, to facilitate gasket & head installation. On the 2 holes in opposing corners, I don't drill them clear through, to help locate the gasket & head properly.
Bill Questionable
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06-12-2017, 02:23 PM | #13 |
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Re: Guide pins
Solution to a problem that does not exist. Or over thinking it.
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06-13-2017, 12:23 AM | #14 |
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Re: Guide pins
Thought the same thing.
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06-13-2017, 09:58 AM | #15 |
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Re: Guide pins
I would think unless everything was disassembled the cost would far outweigh any benefit. No locating pins for 80+ years.
Also do a search on the silicone gasket. FWIW Paul in CT |
06-13-2017, 10:28 AM | #16 |
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Re: Guide pins
I agree with 23hack. I've raced B engines for years with no pins, and great results with longevity, etc.
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06-13-2017, 10:48 AM | #17 |
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Re: Guide pins
i do understand what you all are saying,
there is a reason why all motors from what the mid 40's all have alignment pins installed in the block of some sort are they needed? probably not would they help? probably so sooo i think i will flip a coin and see which way i go i do thank you all for your thoughts T/T |
06-13-2017, 11:05 AM | #18 |
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Re: Guide pins
Let us take a somewhat common sense look at this.
In the early years of V8s the heads were a lot lighter and were easier to reach with a 5lb head and were mostly using studs, which held the gasket in place until the head could be slipped down over the studs, so really, no need for any sort of alignment pins. Now, bring in the Over Head Valve train and the head weight more than tripled and it took a miracle to hold the gasket in place and get that boat anchor head onto the block over the high square fenders without a chain fall. Seems to me that to put locator pins was a MUST just to hold the gasket in place while you and three of your pals muscled the head over the fender and onto the block, and without the locator pins, you would never have that gasket in the right place. So, the natural progression was while using studs, you didn't need locators, and then came the cast iron boat anchors and locators were a must, and then came aluminum because everyone was tired of paying the raising price of chiropractor visits and not enough beer to quiet the complaining pals with back aches.
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06-13-2017, 12:07 PM | #19 | |
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Re: Guide pins
Quote:
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06-15-2017, 08:58 AM | #20 |
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Re: Guide pins
so this is what i did
not sure if you all will be able to see these or not laid the head on last night and there is no movement what so ever |
06-15-2017, 10:50 AM | #21 |
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Re: Guide pins
I see a bushing around a stud! Hope it works for you! Keep us updated!
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06-15-2017, 11:05 AM | #22 |
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Re: Guide pins
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