Rockerarm oiling/ lack of and observations & fix

[mark tucker]

rocker are oiling.well that sums it up. or does it.I recently bought a set of scat 1.25 swivel foot rockers,lightly used(said to be around a hundrad miles) . for the most part that looks like it.very little wear at all shown in the cross hatch from scat on most of the arms.they were not cleaned at all when I got them,no shafts just rockers.I dont usualy buy used stuff but these were cheep and I could use them on a floor engine or convert them to hyd adjusters.whatever. but the reason for this post is the oiling of the rockers.they have a oil hole from the pushrod cup to the shaft bore. and onother oil hole from the shaft bore to the adjuster(witch all were out about 3 turns or more&tight so the geo was way off) well most of the oil holes were slightly intersecting the oil groove in the shaft.some were centered in the groove.but a few rockers were about .030 or more from the shaft grove. on those rockers they all have a weare spot that is brownish blue from lack of oil. it's bad enough that these are spirt oiled unless the lifter bores are sloted.(extra gally should also be drilled). so when you get new or used rockers be sure to make sure they have the oil hole intersecting the slot in the shaft .if they dont have a slot add a groove from the oil feed hole to the adjuster feed hole around the spring/valve side of the rocker shaft bore(not shaft) do not go all the way around.I like to do a snake grove or bannana groove to spread the oil with a 1/8" ball end carbide dremol/diegrinder burr.,it dosent need to be wide or deep.030-.080 wide& .020-.050 deep is fine.stay withen 1/8 of the edges so the pressure isant lost and does it's job.be sure to leave no burrs and clean out the oil channels real good(remove the adjuster before adding groove's). If I had enought brains I would post a pic of the affected rockers, but we all know Im not that smert.Im gladd he didnt clean the rockers,so I could see the gray residue where the shaft grooves are. as always when taking something appart pay attn to what it looks like then figure out why so you can fix it and it dosent happen again.and for god's sake keep the body grinders away!!

[aaaronw]

I would really like to see some picture of this!

[bugguy1967]

Mark, you start topics?? Pictures are worth a thousand words, and run-on sentences!
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"A petrol engine can start readily, run smoothly and give every appearance of being in good order, without necessarily being in good tune." - Colin Campbell, "The Sportscar Engine"

[Laxkraap]

X2

Laxkraap

[fastfil]

Yes, I have to agree with Mark. There's a lot that can be done to improve rocker oiling. I'd just taken my CB 1.3 rockers apart to work on them when I read this thread. I figured I'd throw in some pics....

This is where I plan on adding a groove. I'll add just one groove - from the oiling hole down to where all the force is. (It's hard to get a pen in there, even harder to get a photo!)

I'll post some more after I make the grooves.
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"...swingaxle...transaxle...same diff."

[Quokka42]

Too much work to address a problem that doesn't exist? Many years ago people started adding grooves to the rocker shaft and I believe there are some being sold like this - but how many of you with real world experience have seen galling of the rockers on the shaft? There a couple of ideas for squirters such as drilling the pushrods if you are concerned there is a lack of oil at the valve side, but again it's not an area that shows lack of lubrication.
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There has only ever been one man who was perfect, and they nailed Him to a cross.

[mark tucker]

the nut has spoken!!! so how do these scat rockers have blue spots on the rockers that the oil holes dont line up with the grooved shaft?????yes there are oil grooves, but if the oil hole isant where the groove is it does no good. if you have groved shafts you just need to add a grove from the oil holes over to the shaft grove location on the rocker. when I grove my rockers like pictured hear I do it with a snake patern(S) or bannana (C)grove so it helps spread it across the load aera, not just inline groove. but any thing is better than nothing...unless your a squril. I for one have seen many with gaulded shafts.but none that I have reworked. have you ever seen a shaft mr squril?Im starten to wonder.