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Old 03-09-2006, 11:23 PM   #1 (permalink)
rbr1317
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Rocker Arm retainer replacement alternative?

While searching the net for the plastic retainers I stumbled on another web site that had the following procedure for replacing the retainers with Bolts. Do you think this is a good idea? Or stick to replacing with the plastic ones?

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This procedure is an alternative to replacing the nylon retainers with new ones from a stealer.

Tools required (with rocker arm shaft(s) already removed):

Pliers or vise grips.
¼” ratchet with 7/16” hex socket.
Flat blade screwdriver, approximately 3/16” wide tip.
Claw or grabber tool, normally used to retrieve parts dropped in narrow spaces. A thin magnet tool might also work as a substitute for the claw tool but it will be attracted to the inside of the rocker arm shaft and may prove difficult to use.

Some of these parts may be available at hardware or home improvement stores (source shown is a nationwide distributor of such hardware with no minimum order):

McMaster-Carr P/N 98099A029: Black-Oxide Steel Extra-Thick Flat Washer
1/4" Screw Size, 9/32" ID, 5/8" OD, .172" - .198" Thick
Sold in packs of 10 (16 washers, or 2 packs will be required for one engine)

McMaster-Carr P/N 92620A540: Grade 8 Alloy Steel Hex Head Cap Screw
Zinc Yellow Plated, 1/4"-20 Thread, 3/4" L, Fully Threaded
Sold in packs of 100 (16 hex bolts required for one engine)

McMaster-Carr P/N 93298**10: Grade F Hex Nylon-Insert Flange Locknut (the ** should be replaced with the letter A and the number 1 since they were censored)
Zinc-Plated Steel, 1/4"-20 Screw Size, 7/16" W, 5/16" H
Sold in packs of 100 (16 locknuts required for one engine)

Procedure:

Work with only two adjoining rocker arms at a time. Remove outer rocker arm nylon retainer with pliers or vise grips and discard nylon retainer. Remove rocker arm and repeat procedure for inboard rocker arm but leave inboard rocker arm on the shaft.

Install one ¼” hex bolt through an extra-thick flat washer. Using claw tool or magnet, grab a locknut and snake it into inboard rocker arm position inside hollow rocker arm shaft. Place bolt and washer into place through center of inboard rocker arm and start bolt into threaded locknut by hand.

Remove claw tool and insert screwdriver to jam against flat side of locknut and hold it while tightening hex bolt with ratchet. Tighten hex bolt sufficiently to be able to see the end of hex bolt protrude through locknut. Flange of locknut will deform to conform to inside of rocker arm shaft.

Repeat process after reinstalling the outer rocker arm (match orientation of other rocker arms) and repeat entire process until all nylon retainers have been replaced.

For less than 1/4 of the cost of “remanufactured” riveted rocker arm retainers, as shown on the world’s largest auction site, this procedure will eliminate the nylon retainers permanently.

Photos: (3)
http://pg.photos.yahoo.com/ph/alcuri...cd.jpg&.src=ph

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Old 03-10-2006, 07:33 PM   #2 (permalink)
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If I had a broken rocker retainer I'd replace it with the above mentioned bolt and nylon washer before spending the $70 that gm gets for theirs.

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