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Message started by kennycreed on 09/18/08 at 21:37:47

Title: valve clearance
Post by kennycreed on 09/18/08 at 21:37:47

Hi all, got chain on and up and running,BUT, checking the tappet clearance after running there seems to be very little clearence,when the cngine was cold I set them(after a struggle)at 006 and could just make out a slight movment on the tappet, was wondering if it is normal to have so little movment,,cheers,,kenny

Title: Re: valve clearance
Post by justin_o_guy2 on 09/18/08 at 21:47:33

6 is sloppy. I set them at .003. After I finally set them like that, they didnt need adjusted again for a long time. When I was using .004 & .005, they needed adjusted at 5,000 or less. I found one that needed snugged on the last checkup.

Title: Re: valve clearance
Post by kennycreed on 09/18/08 at 23:10:30

thanks for that, I'll give them another go,it's just that when I try to shuggle them up and down there's just hint of movment, and once she heats up I recon they would be tight. I have the devil's own job trying to get to them,can't get my fingers in there never mind my hand,had to cut and weld fancy extensions bends and angles to screwdriver and spanner to do it by remote control, kenny

Title: Re: valve clearance
Post by justin_o_guy2 on 09/18/08 at 23:28:29

I had to bend the feeler gauges up pretty bad, now, when I do it, I loosen the adj. & get the feeler in there, shug down on it & establish that I CAN push it, if only slightly, then pull & push as I set the adjuster. An offset screwdriver to hold the adjuster while setting the jam nut really makes it easy.

I used tio think the way you do, about the valve stem growing with the heat, then someone pointed out that the valve face grows, too & as it is across the valve seat, it pulls the valve down in the cylinder some, so that offsets the length change. Which one "wins" I dont think anyone knows, Cant remember.

Title: Re: valve clearance
Post by kennycreed on 09/18/08 at 23:44:51

Aye, that's the way,I'll give it another go with my custom curly screwspanner,but I'll have to wait for the shops to open to get another feeler gage,it looks more like a spring now(it.s only 7.40am here). I never thought about the valve face expanding, but when I think about it, what you explained makes pure sense,,k

Title: Re: valve clearance
Post by SV og LS on 09/19/08 at 05:19:42

302F292E33340535053D2F23685A0 wrote:

I used tio think the way you do, about the valve stem growing with the heat, then someone pointed out that the valve face grows, too & as it is across the valve seat, it pulls the valve down in the cylinder some, so that offsets the length change. Which one "wins" I dont think anyone knows, Cant remember.

Warm clearances are tighter. You can check the clearances when the lump's hot, then again when it has cooled down. That's the reason there is a clearance and it is supposed to be adjusted with engine cold. If valve clearances grew when the engine warms up, you could tighten them solid in a cold engine.

Title: Re: valve clearance
Post by T Mack 1 on 09/19/08 at 05:23:35

An old timer gave me this tip.

Using a .004 feeler gauge. Finger tighten the tappet onto the .004 gauge. Then lock the tappet into place. The lock down process will nudge it a little and you will get resutls of between .003 & .004.

Title: Re: valve clearance
Post by kennycreed on 09/19/08 at 09:40:54

Got it, I figured out now where I was going wrong. I set them at 0.06mm the new feeler has the right markings on it .003= 0.08mm .004= 0.10mm. that's why I couldnt feel much movment in them,,k

Title: Re: valve clearance
Post by T Mack 1 on 09/19/08 at 12:06:22

545A5151465C4D5A5A5B3F0 wrote:

Got it, I figured out now where I was going wrong. I set them at 0.06mm the new feeler has the right markings on it .003= 0.08mm .004= 0.10mm. that's why I couldnt feel much movment in them,,k

OOPS.... I should have used metric.... sorry....

Title: Re: valve clearance
Post by justin_o_guy2 on 09/19/08 at 14:35:41

156C0C20222A70410 wrote:

When the jam nut is loosened off, the slop in the threads of the adjuster is obvious( on mine, its nasty)so setting the jam lifts the adjuster up, into the threads, & without a screwdriver holding the adjuster, I think it gets a bit tight, BUT, I am gonna give that a try. If I can save some hassles, I will.