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Old 11-01-2018, 08:53 PM   #1 (permalink)
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Default Installing New Valve Guides A Must?

Does anyone here recommend for installing new valve guides a must even if the specs are within service limits?
I bought the tool to measure mine after my buddy insisted on replacing them for my rebuild. I have a spare head so I don't know if it smoked.
I am doing new valve stem seals.
Do I need to throw $500 into doing the guides?
I think ill be okay even if they are a little looser then spec...?
Any experience or info? I can't find this info anywhere on D's.
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Old 11-01-2018, 11:32 PM   #2 (permalink)
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Guides are a wear issue so it depends on your plans for the car.

If the head has 200k miles on it, replace them. The seals won't do much if the guides are worn out.
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Old 11-06-2018, 07:34 PM   #3 (permalink)
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Guides are a wear issue so it depends on your plans for the car.

If the head has 200k miles on it, replace them. The seals won't do much if the guides are worn out.
I plan on turboing soon with a Greddy 15g. The head has at least 120K? I can't remember. How loose is too loose spec wise?
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Old 11-07-2018, 06:19 AM   #4 (permalink)
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If you have to ask just replace them. Always been my thought process.
I feel if you can't tell without asking if something looks worn or is worn and plan on making reliable power just replace it now and save yourself time of having to do it after all the mods.
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Old 11-13-2018, 06:26 PM   #5 (permalink)
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Originally Posted by 79hilux90crx View Post
If you have to ask just replace them. Always been my thought process.
I feel if you can't tell without asking if something looks worn or is worn and plan on making reliable power just replace it now and save yourself time of having to do it after all the mods.
I'm asking because I don't want to spend the money if I don't have to.
With your thinking I might as well replace everything because its worn. There's no reason to buying new parts if there's nothing wrong with worn parts that are within spec.
Plans for 200whp. 75.5mm bore. 15g turbo.
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Old 11-13-2018, 06:36 PM   #6 (permalink)
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Originally Posted by StuckInTexas View Post
I'm asking because I don't want to spend the money if I don't have to.
With your thinking I might as well replace everything because its worn. There's no reason to buying new parts if there's nothing wrong with worn parts that are within spec.
Plans for 200whp. 75.5mm bore. 15g turbo.
I think the point is that itís a pain in the ass to replace them after youíve re-assembled everything and had the chance to do it previously when things were disassembled.

I totally get your viewpoint. Only replace what needs to be replaced. If you measured the valve stem to guide clearance and itís within spec, then donít bother replacing.

But it sounds to me like theyíre either on the loose side of spec or just outside of it. So I guess the real questions are:

What are the OEM tolerances?
What are your tolerances?
What are you comfortable with and are you willing to tear it apart if itís smoking after reassembly?
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Old 11-14-2018, 07:25 AM   #7 (permalink)
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I think the point is that it’s a pain in the ass to replace them after you’ve re-assembled everything and had the chance to do it previously when things were disassembled.
You hit it on the head

If you can and are worried replace now. Its much easier while its apart to replace, than to pull everything apart to replace later costing much more the second time around.
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Old 11-14-2018, 07:44 PM   #8 (permalink)
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Quote:
Originally Posted by StuckInTexas View Post
I'm asking because I don't want to spend the money if I don't have to.
With your thinking I might as well replace everything because its worn. There's no reason to buying new parts if there's nothing wrong with worn parts that are within spec.
Plans for 200whp. 75.5mm bore. 15g turbo.
I think the point is that it’s a pain in the ass to replace them after you’ve re-assembled everything and had the chance to do it previously when things were disassembled.

I totally get your viewpoint. Only replace what needs to be replaced. If you measured the valve stem to guide clearance and it’s within spec, then don’t bother replacing.

But it sounds to me like they’re either on the loose side of spec or just outside of it. So I guess the real questions are:

What are the OEM tolerances?
What are your tolerances?
What are you comfortable with and are you willing to tear it apart if it’s smoking after reassembly?
I get his point and understand that its more work to tear it apart and replace it but that's not what I'm asking. I haven't measured the specs yet. I'm asking for opinions on replacing the guides if they are within specs of slightly larger than specs. $500 isn't something that I can just throw at if I can be good just running those specs from my head or a spare from pick n pull.
You guys are missing the point of my post. Nobody have any first hand or second hand experience with valve guide specs?
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Old 11-15-2018, 10:47 AM   #9 (permalink)
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Hi new guides are good always make a quiter smoother engine but ive done without as well and gotten away with it. But why is it 500/guides are like 6x16=96. may be old school but i just flip the head and use a dowel knock them out and then gently tap new in. even if you need a reamer its 30. its hard to measure old guides rocking a valve takes doing it a lot before you can just tell or measure. try a new guide and valve with a little oil you will see how nice the fit is. engines parts wear together thats how they can last but once you change things it kind of messes that up
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Old 11-15-2018, 11:38 AM   #10 (permalink)
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If this your first turbo build I would try to find an old engine dont worry about if it smokes or will last. just get the thing set up figure out your oiling,, draing, charge tubes, then tune it a bit. and then use the built engine, most stuff should swap over and you will have lots of things you want to try.
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Old 11-15-2018, 04:17 PM   #11 (permalink)
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If you're real close to service limit, you aren't taking a big risk. You might be able to have the guides knurled . When I had less funds and more time I would use it if it's close to service limit. Particularly when you have a spare head.
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