HIGH PERFORMANCE HYDRAULIC ROLLER TAPPETS
FOR HARLEY BIG TWINS
powered by:
B-M-O Products, L.L.C
5785 Serenity Lane
Marbury, Md. 20658
(301) 743-3215
bmoproducts@aol.com
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*LIMITED QUANTITIY OF BLEM SETS ARE 100% MECHANICALY SOUND BUT HAVE MINOR IMPERFECTIONS IN THE CHROME FINISH,
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INSTALLATION
VELVA TOUCH™ ANTI-PUMP HYDRAULIC LIFTERS
INFORMATION AND INSTALLATION INSTRUCTIONS IMPORTANT NOTE: PLEASE READ THESE INSTRUCTIONS THROUGH AT LEAST ONCE PRIOR TO STARTING INSTALLATION OF YOUR
NEW VELVA TOUCH™ LIFTER KIT
First, inventory your new Velva Touch™ Lifter kit making sure all parts are on hand and that it is the correct kit for the make and model of your bike. Then, remove your spark plugs, existing push rod covers, push rods, lifter blocks, and existing gaskets from the engine. Make sure the gasket sealing surfaces are clean and clear of any remaining material or debris and ensure no parts or debris fall into the lifter block mounting holes in the crankcase. You are now ready to proceed with the installation of the new parts.
1. Your new lifter blocks are designed to bolt into place the same as the original
stock Harley Davidson™ lifter blocks using either the original eight (8) socket
cap screws or the eight (8) twelve (12) point cap screws provided with the kit. Be
sure the bolts match the threads of the crankcase.
2. Place the front and rear lifter block into position with the supplied gasket. CAUTION !!
Be sure front and rear blocks do not touch each other when mounted in crankcase. If they
do touch only a small amount of filing is usually all that is needed to correct this issue.
Some crankcase top studs in certain engines may have to be installed so that the head
of the bolt does not interfere with the base of the rear lifter block, put nut and
washer to the opposite side. If the top of the bolt still hit’s the base of the lifter
block and the screws cannot be installed with finger pressure, remove the top
bolt, then take a file and remove only enough material from the head of the
bolt to allow the lifter block to fit ( Use of a machine lathe would be better if
you have access to one ). Make sure the bolt is cleaned and no filings get into
the crankcase or the lifters. Touch up the bolt head with flat black engine
enamel and reinstall in the crankcase.
3. Install your new rear lifter block with gasket and tighten the screws to 110
inch-pounds of torque. Use blue Loctite™ on the screws.
4. If the cam in your engine is any other than the stock Harley Davidson™ cam,
before installing the front lifter block, look through the front lifter block
locating bore and visually check to make sure the cam lobes clear the bottom
of the rear lifter block. Slowly turn the engine over by rotating the rear wheel,
with the transmission in high gear and the spark plugs removed. Make sure the
lifters do not fall out of the slots that keep them aligned with the cam lobes.
these lifter blocks have been machined to accommodate cams with a lift up to
0.620 inch with no interference, but there are many cam variations as well as
crankcase variations that might cause minor interference.
5. Install your new front lifter block with gasket and tighten the screws to 110
inch-pounds of torque. Use blue Loctite™ on the screws.
6. As a precautionary measure, with the spark plugs still removed, turn the engine
over by hand using the rear wheel or the kick-starter to ensure there is no
binding or interference with the lifters. All four of the lifters should move
smoothly up and down before proceeding. We have encountered no
interference problems with this kit and want to know of any problems
encountered in the field. If there is no problem here continue the installation
with the pushrods.
7. The pushrods are installed using either cork gaskets, rubber o-rings, or Quad seals
along with the stock Harley Davidson™ covers. The Harley Davidson™ o-rings
or Quad seals work best with cam lifts over 0.485 inch. If using orings or Quad seals seals except in Evo kits which includes push rod covers and seals). In stroker engines and engines with high lift cams, the front exhaust pushrod
the 1979 and up Shovel stepped lower push rod tubes are recommended. Use the
combination of gaskets, o-rings or Quad seals that works best for your application.
(no seals are provided due to personal preferences and multiple choices of
almost always contacts the inside of the upper pushrod cover. The Velva Touch tapered
push rods allow more clearance to help with this issue.
8. Setup of the new lifters and adjustment is as follows:
a. Start with the front lifters and front cylinder. Place your finger on the top
of each hydraulic tappet, turn the engine over slowly until the exhaust
lifter tappet rises and returns to it’s lowest point, continue until the
intake tappet also rises and falls to it’s lowest point. Now both the front
intake and exhaust tappets are on the heel of the cam and can be set together.
b. Install all of the front pushrod seals; top, middle and bottom
(customer supplied except Evo kits)
c. The longest push rod is installed the front exhaust position, the other 3 push
rods are of equal length. Adjust the pushrods for minimum length;
d. Insert the pushrod in the rocker arm;
e. Slide on the collapsed pushrod cover and hold up;
f. Slide the base of the pushrod over the tappet, and;
g. Adjust the pushrod using a ¼ inch open end wrench to hold the adjuster
( up under the locknut works best ), then;
h. Rotate the pushrod with the thumb and forefinger until the pushrod is
screwed out enough to be seated in the tappet with no up and down movement.
9. If the engine is to used mostly for touring and street use:
a. Turn the adjuster out with a ½ inch open end wrench an additional 1 ½ turns
or nine (9) wrench flats only;
b. Hold the adjuster with the ¼ inch wrench and spin the lock nut up;
c. Tighten the locknut with two ½ inch open end wrenches while holding
the adjuster with the ¼ inch wrench.
d. Adjust both the intake and exhaust this way cold, then;
e. Expand the pushrod sleeve and install the retainer. This adjustment
provides the quietest possible setting for Panhead and Shovelhead
engines.
10. CAUTION !! Before rotating the engine to install the rear cylinder pushrods
allow the lifters to bleed down, (The pushrods will turn by hand when ready)
failure to this could bend a valve.
11. Position the rear cylinder lifter block tappets on the heel of the cam using the
method in step 8, then adjust the pushrods as described in step 9, EXCEPT,
turn the adjusters out one (1) full turn, or six (6) wrench flats! Expand the
sleeves and install retainers.
12. If the engine RPMs above 6500-6700 are anticipated, as in the case of an all
out street fighter the lifters must be adjusted finger tight cold as in
step eight (8);
a. Then turn the adjusters out seven (7) wrench flats for the front
cylinder tappets;
b. Let the lifter tappets bleed down;
c. Position the rear cylinder tappets on the heel of the cam;
d. Adjust the pushrods four (4) wrench flats for the rear cylinder lifters;
e. Expand the pushrod sleeves and install the retainers.
f. For drag race engines, set at zero (0) valve lash hot!!
NOTES
1. If the valve action sounds noisy, check the following:
a. Oil pressure when hot must be within Harley Davidson™ specifications.
Specifically: Minimum of six (6) PSI at idle and 12-35 PSI at 2,500 RPM.
b. For best overall performance use 20W-50W multi-grade motorcycle or
air-cooled engine oil and the engine should have 25-35 PSI at 2,500 RPM.
2. If the engine oil pressure is within these limits and the tappet(s) is (are) still clicking:
a. Allow the engine to cool, and;
b. Re-adjust the offending tappet(s)
3. Buy yourself a mechanics stethoscope.
a. Place the tip on the points cover, engine idling and hot. If you hear an
audible click here, listen closely then;
b. Move the tip to a place on the lifter blocks next to each lifter bore.
c. Compare the sound to the points cover sounds.
d. Next place the tip of the stethoscope on the front exhaust flange then
the rear exhaust flange.
e. Compare the sounds.
f. Next place the tip on the face of the rocker box area of the intake pushrod
tubes.
g. Compare these sounds to the others.
4. In an engine that has the proper:
a. End play in the rocker arms (0.012-0.014 inch);
b. Proper fitment between the valve stem and valve guide;
c. Has the correct endplay at the cam shaft (0.004-0.006 inch), and
d. Has the proper fitment between cam gear and pinion gear, then;
e. It is normal to hear only the sound of the rollers turning in the tappets,
hot or cold.
5. When you compare the sounds in Note 3, and you hear a clicking sound at the points
cover and it is the loudest here, it indicates that the fitment between the cam gear
and the pinion gear is loose. (This is the most common problem)
6. If you pick up about the same sound at the lifter base as in the points cover it is normal.
7. If the sound is loudest at the exhaust flange the exhaust valve guides are loose.
8. If the sound is loudest at the intake flange the intake valve guides are loose.
9. Once the Velva Touch™ lifters are installed and properly set they need no further
adjustment and are best left alone, unless the top end or some other problem
requires a tear down necessitating re-adjustment. by Blue Loctite™ and hand tightened only. Screw can be removed or left
in place it serves no other purpose other than keeping tappets in place.
10. The flat head screw that keeps the tappets from falling out of the lifter block is
11. The tappets can be exchanged between lifter blocks, but it is best not to do so.
12. The pistons inside are select fit and must never be interchanged with each other.
13. Once a year remove and clean the screen that filters the oil supplied to the lifters.
14. The tappet bodies are hardened tool steel, pistons are chrome plated, ends are tool steel, heat-treated.
The pushrods are lightweight 4130 Chrome-moly steel and machined tapered for maximum strength.
15. Always install the longest pushrod in the front exhaust position.
Kit covered by US Patent Number 4,589,384- Hydraulic Roller Tappet Assembly
VELVA TOUCH™
B-M-O PRODUCTS, L.L.C.
5785 SERENITY LANE
MARBURY, MD. 20658
(301) 743-3215
velvatouchlifters.com bmoproducts@aol.com