KNURLING VALVE GUIDES: THE PROS AND CONS
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- Опубліковано 25 вер 2021
- HOW TO: KNURLING VALVE GUIDES : THE PROS AND CONS
Sometimes "old school" gets a bad rap. I have found that the real problem is a lack of information, in this video, I explain the reasons you can knurl a valve guide and when you shouldn't. - Авто та транспорт
Excellent explanation! Minor nit, knurling "upsets" parent metal rather than "cutting" it which is why knurling doesn't generate chips.
Yes, upset is the word
I have never seen a knurled guide that shouldn't have been replaced instead of knurled. Very few people use guide knurlers right, and I think you may be the first I have actually seen. I have been using k-line bronze liners instead of knurling since it is fast and you usually cut enough out to have a straight guide again, and they are very forgiving in regards to valve material.
The ploughing a field analogy helped me understand this well. Thank you and good video.
Very welcome
I learn alot about engine work from this man. You know they don't really teach this stuff in college because they don't have the time to tell you.
Knurling valve guides? You gotta be kidding me, man! I guess there are two of us left in the world who do this! My sets have burnishers, not reamers for the final pass - I like 'em because you leave no raw edges - the burnisher just compresses the metal ridges left by the knurler to finished size, leaving a nice, smooth surface with a good oils spiral. Not all tools are created equal. Great video, especially stressing when to knurl and when to replace.
I'm so glad you understand, it's not for guides that need to be replaced and actually retain oil better.
I was taught how to knurl the guides over 30 years ago in automotive tech school. Granted it's not the best choice for all applications. It's been about 60% of actually replacing the guides to 40% knurling the guides.
Second that with the burnishing, no metal removal
@@MrDanielSoliz Can knurling be used to tighten bronze inserts ? tks
@@luckyPiston no I wouldn’t do that. The liner is to thin.
More please. Even if we don’t do it we can choose a knowledgeable shop . Thx.
Knurling Knowledge 101 ! How about a video on how to achieve proper " installed valve spring height ".
yes sir, I like that Idea.
Very high quality video, tons of information, stayed on topic the entire time. Thumbs up from me.
Still love watching this video. I just realized why the speed reducer is necessary. Unlike a sharp tap which cuts threads and removes metal, the knurler is duller in order to mash through the hole and move metal instead of removing it. That must take some serious torque.
Yes sir, makes me happy that you understand!!!! 🙌
Glad to have you back! Always educational!👍
This channel is outstanding.
Thank you!
As always, thanks for sharing your knowledge!
Would love to see another video about liners.
Hey Danny, Great job on that definitely do more on the different valve guide options have a good one👍
Thanks! Will do!
Love you dude:) looking forward to book club:) the knowledge and confidence you have is amazing! See you in a week or two:) hi and hug's shopmom:)
Excellent content, awesome graphics, superior music .. Thank You Shop Mom.. yeah.. Danny was OK too😆
Sweet video! Thanks for taking the time to show us..
Our pleasure!
Now they sell rebuilder valves. These valves are made with thicker valve stems for worn valve guides. and they come in different stem measurements.
Yes, years ago we ran the San Antonio Enginetech warehouse. There ok for low budget rebuilds but I don’t like adding weight the valve train and later some shop is going to have to replace all the valves and guides if they don’t have the oversized tooling. We use to have to give the tooling to shop just so they could do it.
I didn't knew about this, but i'd get it with the drawings; i never seen that speed reducer thing on the garage that i'd worked on, but i've seen it on the construction.
Love your channel bro! If you need a 45 yr old apprentice give me a holla!!
My personal cut limit for knurling is .0008 over desired finish size. Example 8mm LS hardened iron guide i finish at .0015 To .0018 so the maximum guide wear I will knurl is .0026 This number is also with in the GM published service limit. On a non-hardened guide application such as older GM and almost all replacement guides I just replace them. I don't feel a knurled and reamed non-hardened guide will provide the service life I want my product to go out the door with. As for lubrication when I knurl and ream a guide I store my knurls and reams for a specific size in a can filled with WD40. the keeps all the tools at a constant temperature as well as lubricated. I also use 8 reamers on v8 head one pass per reamer per guide as the reamer Gets hot with each pass. with heat the finish size changes.
Danny: I love your work and advise. Please continue...
Thank you
More valve guide repairs please 🙏
solid video very informative well put together 👍
Thank you.
Fantastic video, thank you Danny!
I have a customer that wants larger valves and seats installed on corvair 140 heads. The guides have .006 + wear and he said it will be fine go ahead a do it ive been doing this awhile. Ya i dont think so.
Came upon this video great video😮
Glad you enjoyed!
Great job, thanks
Thanks for the video
Great video
Thanks!
Good info
Your videos are great, thanks for taking the time to make them. You mentioned doing a video on replacing the guides, that would be much appreciated, I have so many questions about that.
I would like to replace a few guides in a 4 cylinder Honda head. I bought the replacement guides directly from Honda but the service manual doesn't cover all the technical details for replacing them. For example, the guide part numbers say they are oversized which I think refers to the OD (I haven't removed the originals yet to confirm that). I'm assuming there is a standard interference fit and they make the OD oversized so that can be achieved before installation. But what is that number? How oversized should the new guide OD be in relation to the aluminum hole it's being installed into? My other concern is once I install the new guide how likely is it that it'll be concentric to the original valve seat cut? A video covering this info or a comment reply would be very helpful, thanks again.
The next time I do a Honda valve guide I’ll do that. I may be able to do a general guide video where I can answer your question and give tips and advice. Maybe able to that this week if that helps.
@@MrDanielSoliz Thanks for the reply, yes, that would be very helpful. Looking forward to it. Btw, I love watching you and Faye, hands down, salt of the earth people!
The oversized guide will require the guide boss or hole to be sized for the guide. There should be a.004 to .008 interfearance fit depending on application. Unless the original guide hole is damaged and will not hod the guide you should be able to but a standard size (OD) guide to go in with out resizing the guide hole. As for the seats they must be recut once the guide is replaced.
great info!
Thanks for watching!
Should have mentioned proper clearance for a knurled guide. Informative
The clearance would be the same as an unknurled guide,
@@MrDanielSoliz most people don't know that. Or what that number is let alone how to measure it. Hey where's my like ? Just trying to help out.
I was hoping to see how to measure the clearance on the valve to guide??
Nice video! I'm working on a flathead. I am getting .060 oversize valves both I&E. I recently purchased a set of Sioux Tools to do this. My question is this: I don't seem to have the .850 Pilot Holder? Do I use the new removable valve guide instead of the Special pilot holder?
Yes you can , just make sure it’s not to loose.
I have guides that are .2362 and the valves are .2342 What size Knurl tool would I use? The guides are straight. If you could help I would be thankful. Great Videos.
Nice!
Thanks!
Got me... I did snicker a little :)
So did I!
Orale Dan!👍
Very cool! That Head was very interesting! What is it from??
Hyster forklift cylinder head.
Wow not what I was expecting! Always wondered what they looked like
Mmmm... corded tools 🙌🏼
You know it!
Did you see the state of that cord???
👍
Awesome. Pls tell me. If im doing 11/32 V8,s. What size nurl and what size ream do i use first. Mike.
You will need an 11/32 knurled ( they only make one 11/32 ) and I would start with an .341 reamer. Depending on what valves your using. Factory and aftermarket are different. Factory would put the clearance in the valves. Exhaust smaller stem then intake. Aftermarket are all the same stem and you add clearance to the guide. (.341 intake and .342 exhaust) just an example. Hope this helps.
@@MrDanielSoliz Right, got ya. So the exhaust should always have more clearance for expansion. are those reemers 11/341 etc. I
@@michaelgiglio1571 11/32” = .341 “
@@MrDanielSoliz saved me a lot of time. Tnx
I had heard of knurling valve guides but never new how it was done. Is there any performance advantage for knurling?
Yes their is, If done correctly,you can run tighter clearance’s.
Who or where do you buy the reamers or knurls from. Or a brand name.
Call shop mom also try eBay.
I have worn valve guides, which should maybe be replaced , going to measure them up and see. But the engine is a flathead 8 that is in the car and if I was to knurl the valve guides I would not be able to go all the way through. Is it possible to knurl all the way down and then back the knurler out, or is that an absolute no no?
I’ve never backed one out. Sorry it’s so late but on Monday I could try it on an old head and see if it works. Let me know.
@MrDanielSoliz That would be fantastic if you could try and let me know. Thank you!!!
What are your thoughts on using valve guide liners??
@@MrDanielSoliz I don't think you need to try backing out a knurler for my sake, I was just speaking with an old time mechanic and he said my valve guide are too brittle and won't knurl. Cheers!
Where can I find that drill speed reducer
I’ve had it for so long I don’t remember where I got it. My goto place to find tools is eBay.
HELP?!?! So after talking to others and finding the valve guides on my Packard are too brittle to successfully knurl I decided it would be best to replace them, but the first one is STUCK, I can't get it to budge. I did manage to get the top to break off. 😕 Have any tips or tricks for removing stuck valve guides?
I would drill out the old guide. Stay slightly smaller then the guide and that should help break it loose.
@@MrDanielSoliz Thank you! I had wondered about drilling them out as well. Cheers!
it is the best procedure to have an engine burn oil past the valve guides, a worn out guide must be replaced or a liner installed.; on commercially knurled guides, there is a portion in the lower part of the guide that is not knurled to prevent massive oil consumption, it is not the case the way the knurling tool is used.
I had a very bad experience with knurled guides...never again.
Thanks for the comments, this is exactly why I made this video. Some people think knurling valve guide is the same as replacing guides and no or isn’t! If you needed guides the shop should of replaced them and no they don’t smoke and no the spiral does not make it smoke. Check out K-line liners and they have a spiral all the way down. I’ve knurled thousands of guides and have never had on not work or not last. Once again if anybody is reading this don’t knurl a guide that needs to be replaced. It won’t last and leave a bad taste in your mouth and you will think it doesn’t work. Think about it if I tried to paint over oil and then said oh that don’t work. Don’t make any sense. This video is to help people understand the pros and cons of knurling. Hope this help you understand what happened.
@@MrDanielSoliz botched work is the main reasons why I gathered some equipment and now, I do my own valve jobs, I use sleeves as that needs much less equipment to install and it fills the bill for most gas engines, most engines i do now are intended for boating use ( about 3 month a year here )
For sure that a solid replacement guide is the perfect answer for a long lasting engine as an heavy duty diesel as often on these engines, the guides are replacable and fiddling with sleeves has no real advantage.
Again . Measure the clearance of the valve stem to valve guide. There are specifications. If you are working on junk do it your way. Lets see the finger exercise. Good for grandmas car not a racing engine or for a truck or boat.
You don't knurl the valve guides you cross-hatch hone the valves! Duh!