John-T-53 Posted January 28, 2012 Report Posted January 28, 2012 I cannot find valve guides that are the correct ID. EGGE machine's guides are too big (by .002") which is out of spec. My clearance was .004" when it should be .0015 - .002". Usually guides come undersize which allows you to hone them out. Anyways, I've replaced the guides in my truck and ground the seats, and don't want to do it again. But the engine's still smoking and I'm burning oil (on a relatively new motor). It needs to be right! I'd like to find intake valves with a larger stem. Has anybody ever done any research into this, and would it be possible? Thanks, Quote
Plymouthy Adams Posted January 28, 2012 Report Posted January 28, 2012 I have not messed with the engines of the heavier trucks, they had sodium filled valves and positive rotators..I would think the blocks OD guide bore would be same regardless of the valves..could it be that the larger trucks heavier valve guides are being used and you have the lighter duty stock valves for a 1/2 ton..in other words, did you check the inside diameter of maybe the car engine guides to see if they were small ID's that could effectively be reamed to the size you need? and I am sure you took note that the install of the exhaust guide is different that the intake though the part is the same.. Quote
MBF Posted January 28, 2012 Report Posted January 28, 2012 When I did the valve job on my 230 two years ago, I took a couple of the valves to an engine builder/machine shop. He measured both and was able to get me the intakes, exhausts, and guides. I saw what he was ordering from, it wasn't a NAPA type catalog for application, it was a sizing type catalog that showed just dimensions. You may want to try that route. Mike Quote
Plymouthy Adams Posted January 28, 2012 Report Posted January 28, 2012 I just not too long back posted the link to such a chart..it was by Melling...just type Melling valve into the search..only two results..go to the bottom thread by John T-53 (is this you?) see entry #13 Quote
Merle Coggins Posted January 28, 2012 Report Posted January 28, 2012 When the machine shop replaced my galve guides he needed a pair of valves so that he could get them reamed to size and properly center the valves. I'm not sure where he got the guides but they all looked good when I got it back. Merle Quote
Don Coatney Posted January 28, 2012 Report Posted January 28, 2012 I have installed Chevy valves in my engine but I do not recall the shaft size. Quote
Mike@DRH Posted January 28, 2012 Report Posted January 28, 2012 You can install a .060" wall bronze liner in the existing guide and ream, or ball broach, it to the correct size. They are installed with the guide in the engine. We have these in all types of engines. The bronze liner is probably a one time repair to the valve guide. Even on a everyday driver you'll never put enough miles on to wear it out. Quote
John-T-53 Posted January 28, 2012 Author Report Posted January 28, 2012 (edited) I just not too long back posted the link to such a chart..it was by Melling...just type Melling valve into the search..only two results..go to the bottom thread by John T-53 (is this you?) see entry #13 Tim, Thanks - great link. That wasn't me ('twas "John Teee"). There's another "JT" on here competing for the moniker. Ha! Anyways, I'll have to study that and see what's available. Replacing just the valves would be easiest, and I might have to change to a different keeper and spring retainer, but anything avoiding more machining is preferable. Even though my buddy down the street has a machine shop and available at my disposal...I will ask him about the bronze liners. On that topic, I might like that idea because bronze has very good wear properties...a lot of european makes have all-bronze guides. I did do some late night searchin on SBI's online catalog and found these: Potential replacement: http://www.sbi-e-catalog.com/PartDetail.aspx?PartNumber=01193+3&PartType=Valves These look like they'll need some lathe work to cut the relief area just up from the tip. OEM valves (for comparison) http://www.sbi-e-catalog.com/PartDetail.aspx?PartNumber=00298&PartType=Valves Edited January 28, 2012 by John-T-53 Quote
Rusty O'Toole Posted January 28, 2012 Report Posted January 28, 2012 Usually in a case like this an auto machinist will knurl the guide and ream it to size. This is standard rebuild stuff. Quote
John-T-53 Posted March 1, 2012 Author Report Posted March 1, 2012 Anybody have a spare spring retainer and pair of keepers they could send me? I aquired Chevy valves with thicker stems that I'm gonna adapt. My buddy is going to help me machine them in his shop, the only question remaining is will the keepers work with the mopar retainer? I need a set to mock up, and since I need my truck I can't easily rob the motor for parts. The Chevy valves have a shaft of .344" which should allow some room for honing the existing guides. The mopar valves are .340". Any help is appreciated! Quote
Dave72dt Posted March 1, 2012 Report Posted March 1, 2012 According to your SBI guide, intake and exhaust guides are different IDs. All new guides? Maybe you have a full set of exhaust guides. Original valves may have the stems wore down. Because they're pressed in, the ID generally closes up a bit and requires reaming to fit to clearance the valve. Valves have a harder stem surface than the guide material is and you don't want to machine that off so even with the larger stemmed valves you're going to have to ream to fit. Quote
John-T-53 Posted March 1, 2012 Author Report Posted March 1, 2012 According to your SBI guide, intake and exhaust guides are different IDs. All new guides? Maybe you have a full set of exhaust guides. Original valves may have the stems wore down. Because they're pressed in, the ID generally closes up a bit and requires reaming to fit to clearance the valve. Valves have a harder stem surface than the guide material is and you don't want to machine that off so even with the larger stemmed valves you're going to have to ream to fit. The stock guides are the same for intake and exhaust. Valve stem dia's are the same too. The guides available are just too bid I.D. where they are supposed to be undersize so they can be honed for the right clearance. With the Chevy valves, honing the ex. guides is exactly the plan. We still need to cut the head and the tip though. Just need a spring retainer to mock up first! If anybody's got an old one sitting around... Quote
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