JIMS 18526-PG User Manual

Instruction Sheet For No.18526-PG

Power Glide Tappet

Sportster

Fits 1991-present

Install tappets per H.D.® Service Manual.

1. These tappets will work best with a running clear
ance of .0008” to .0013”.

2. JIMS® Power Glide™ Tappets are assembled with a

small amount of oil to ease in the adjustment. This

way you will not have to bleed down the tappet at the time of final adjustment.

3. If the pushrods you are using are adjustable proceed as follows.

4. With the Power Glide™ Tappet installed, start with the front tappet at the lowest point on the cam,
extend the pushrod to zero lash (no up and down play, but has a light spin).

5. Extend the pushrod adjuster 15 wrench flats if pushrods have 24 threads per inch, 17 wrench flats if
pushrods have 28 threads, 18 wrench flats if your push rods have 32 threads per inch, 24 wrench
flats if your push rods have 40 threads per inch and 30 wrench flats if your pushrod has 52 threads
per inch. Tighten lock nut.

IMPORTANT NOTE: This adjustment will make the pushrod tight, which will bleed the hydraulic lifter. It will

take 10-15 minutes, or longer, to bleed off. It is very important that the engine is not rotated while
pushrods are tight. The pushrod will spin with your fingers after it has bled off properly.

6. Recheck lock nut, close covers and install clips.

7. Repeat exact procedure on rear set.

8. Turn motor over several times to pump oil into the Power Glide™ Tappet or until the oil light goes out,
or oil is returning to the oil tank.

CAUTION: Use motorcycle oil 20-50w at best

Pushrod Adjustments

Distance Distance Threads Wrench Total Travel
per turn per flat per inch Flats Distance

.0417 .0089 24 15 .1042”
.0367 .0059 28 17 .1011”
.0313 .0052 32 18 .0937”
.025 .0042 40 24 .100”
.0192 .0032 52 30 .0962”

Popular Pushrods

JIMS® 32 Slim-Jims
Andrews 28
Andrews 32
Crane 24 Time Savers
Crane 32
H.D. 32
S & S 32
Rivera 40 Taper Lite

The following is sometimes mistaken for noisy tappets:

A. The most common being the clearance between cam gears and pinion gear (referred to as gear

lash). If you did not change the cams at the time of installing this kit and had no gear lash but a

slight whine when motor was cold it is safe to say you are OK in this area.
B. Rocker arm end play .004” to .010” is good.
C. Oil pressure at normal operating temperature about 2500 r.p.m. should be 10-75 p.s.i..
D. Check valve to guide clearance.

Rev C

9/99

No.2273-IS

“From the Track... To the Street!”

555 Dawson Drive, Camarillo, CA 93012 • Phone [phone] • Fax [phone]

Tappets

PROPER TORQUE

OF SCREWS

FLATNESS OF GASKET

CLEARANCE BETWEEN
LIFTER AND BORE

SQUARENESS OF BORES TO
LIFTER BLOCK FACE

SQUARENESS OF TAPPET
BLOCK BORE TO CAM LOBE

SQUARENESS OF AXLE TO ROLLER
CAM SHAFT END PLAY
PARALLELISM OF ROLLER TO CAM LOBE MAIN-

TAINING COMPLETE SURFACE CONTACT
OPTIMUM CONDITION WITH ROLLER MAKING

FULL CONTACT ON CAM LOBE RESULTS FROM
MAINTAINING CLOSE TOLERANCES

MAINTAINING PARALLELISM

FROM THE DECK TO THE CEN-

TER LINE OF THE CAM (INSIDE)

MAINTAINING

PARALLELISM (OUTSIDE)

CENTERLINE OF CAM BUSH-

ING IN CAM COVER IS

COAXIAL TO CAM ROLLER

BEARING IN CASE

You and your Harley® have just taken the first steps towards owning the finest precision designed and engineered valve

train components known to the Harley-Davidson® market. JIMS® tappets, tappet blocks and cam covers surpass the stock
requirements and demands of the present and future Harley-Davidson® motorcycle.

To achieve the best life possible from this tappet (or any other valve train part) you must be aware of some very impor­tant issues.

1. Clean! Clean! Clean! You must use the best possible oil and oil filter available for your Harley-Davidson®. Use
only motorcycle or air cooled type engine oil. No Substitutes!

2. If these tappets are being installed in a motor that has had motor problems, or was rebuilt, wash out oil tank, oil
feed lines and motor.

3. If these tappets are replacing a previous tappet and cam problem, please make sure you know what caused the prob
lem in the first place.

4. The first area of concern is that the tappet roller must seat flat on cam. JIMS® tappets are square from the tappet
body to the axle bore within .0002”. If the roller is not seated flat on the cam, it will fail within a short period of
time.

5. Second concern: The same holds true for the tappet blocks. JIMS® tappet blocks are machined to hold the bores
perpendicular to the mounting flange within ±.0002 of an inch.

6. The next important concern is alignment of the cam itself. First, the cam will be, or should be, parallel from the two
bearing journals to the lobes within ±.0002, (this is just the cam). With the cam installed in the motor this can be a
lot different. For this reason, JIMS® has a precision machined cam cover to hold your cam to within .0002” of cam
centerline.

As you can see from some of the examples there are a lot of possible reasons for your valve train to have a shortened life.
For this reason JIMS® is continuously helping you achieve the longest possible life for your valve train.

Congratulations

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WARRANTY

All JIMS® parts are guaranteed to the original purchaser to be free of manufacturing defects in materials and workmanship for a period of six (6) months from the
date of purchase. Merchandise that fails to conform to these conditions will be repaired or replaced at JIMS® option if the parts are returned to us by the dealer (purchaser)
within the six (6) month warranty period or within ten (10) days thereafter.

In the event warranty service is required, the original purchaser must call or write JIMS® immediately with the problem. Some problems can be rectified by a tele­phone call and need no further course of action. A part suspected of being defective must not be replaced by a dealer without prior authorization from JIMS®. If it is deemed
necessary for JIMS® to make an evaluation to determine whether the part is defective, it must be packaged properly to prevent further damage and be returned prepaid to
JIMS®with a copy of the original invoice of purchase and a detailed letter outlining the nature of the problem, how the part was used and the circumstances at the time of fail­ure. If after an evaluation has been made by JIMS® and the part was found to be defective, repair, replacement or credit will be granted.

ADDITIONAL WARRANTY PROVISIONS

1.) JIMS® shall have no obligation in the event a JIMS® part is modified by any other person or organization.

2.) JIMS® shall have no obligation if a JIMS® part becomes defective in whole or in part as a result of improper installation, improper maintenance, improper use,

abnormal operation, or any other misuse or mistreatment of the part.

3.) JIMS® shall not be liable for any consequential or incidental damages resulting from the failure of a JIMS® part, the breach of any warranties, the failure to

deliver, delay in delivery, delivery in nonconforming condition, or for any other breach of contract or duty between JIMS® and a customer.

4.) JIMS® parts are designed exclusively for use in Harley-Davidson® Motorcycles. JIMS® shall have no warranty or liability obligation if a JIMS® part is used in

any other application.

Applies to

Big Twin and XL