Page 8 - 2014E-TypeSupplement

Specialty Engine Parts

Long-Style Tappets

Sometimes progress isn’t really progress at all, but let us explain:

From the XK-120 through the early Series II XJ-6, Jaguar supplied
“long-style” tappets; they then switched to a shorter version (by

3.175mm or about 1/8”) and have since superseded the item
many times to a part that hardly resembles the original. While the

current part may be great for a new V-8, we feel the original de-
sign is best for older engines. The extra length spreads wear to a

larger portion of the tappet bore and can reduce rocking, result-
ing in a quieter-running engine. These tappets are manufactured

by XKs Unlimited to exacting tolerances. We recommend replace-
ment in engine-sets only. (Long-style tappets were itted to all
8” Taller
E-Types, including V-12s.)

Order Number Each CO-44010

Why Fuss Over 1/8 Of An Inch ?

Camshaft
In the illustrations you see as the camshaft ro-
tates it pushes the tappet down the tappet guide Tappet Guide

against the resistance of the valve spring. Of Tappet
course as the camshaft continues its rotation the

valve spring pushes the tappet back up the tap- Valve Spring
pet guide. The shorter the tappet the greater the
Valve
likelihood for the tappet to ‘rock’ or ‘wobble’ in the

tappet guide. This rocking leads to undue wear,
causing a ‘rattling’ sound from the valve train. The

long-style tappets are the sure-ire cure to quiet
running. If you’re having your head redone, make

sure to use top quality parts throughout, and es-
pecially these longer tappets. Less than $10 each

buys a lot of peace of mind.
The cutaways above illustrate the short distance the tappets travel, height-
Reduce Mechanical Clatter!
ening the need for the long-style tappet. Note we’ve chosen to show only a
single valve spring for clarity.

Valve Keepers
Six-Cylinder through 1987 and all

V-12. Made to precise tolerances
to provide a strong clamping
action on the valve. Sold as

individual pieces, two (2)
required per valve. Manufac-
tured by XKs Unlimited.
Valve Spring Retainer/Collar
Order Number Each
JA-EBC2997
Six-Cylinder through 1987 and all V-12.
Sold each. Made from chrome-moly steel to eliminate
the original’s tendency to stretch and alter valve-train

geometry.
Order Number Each
CO-27480
Valve Spring Seat, Six Cylinder Engines

Through 1987
For use with later “short-style” valve hardware
that accommodates valve stem seals.
Manufactured by XKs Unlimited.

Order Number Each CO-27481

Exhaust Mount “Pin”
Tapped Plate
800-444-5247
For Series I And II E-Type 2+2. Supports Rear Resona- Engine stabilizer plate, six-cylinder E-Type
805-544-7864
tors. Stainless Steel. Manufactured by XKs Unlimited.
Mount Pin CO-26160
Order Number
CO-21201

8 New Parts Supplement
www.xks.com