Hydraulic Valve Tappet/Lash Adjuster; Camshaft End Play - Ford LRG-423 Service Manual

01-13
Engine Service
01-13
SERVICE PROCEDURES (Continued)
7.
Remove the intake manifold assembly as
outlined in Section 02.
8.
9.
Remove flex hose and manifold adapter from the
hand-held vacuum included with the Rotunda
014-00975 Carbon Blaster and Automotive
Borescope. Insert tapered end of vacuum hose
into intake port of cylinder head using a twisting
motion to ensure a tight fit.
NOTE: Detailed written instructions and a
procedural video tape are included with the
Rotunda 014-00975 Carbon Blaster and
Automotive Borescope. Perform the intake valve
carbon cleaning procedure, using the Rotunda
014-00975 Carbon Blaster or equivalent. The
intake valves should be in the closed position.
Cleaning takes approximately 1 to 1 -i/2 minutes
per valve.
10
11
13
Confirm the intake valve (6507) is clean using
Rotunda 014-00975, or equivalent automotive
borescope.
Using a remote starter switch, bump the engine
over until the remaining intake valves to be
cleaned, are in the closed position, and clean
them as outlined above.
. -. Install the intake manifold as outlined in Section
02.
Camshaft Lobe Lift, 2.3L Overhead Camshaft
Engine (Camshaft Installed)
This procedure is for checking lift with the camshaft
(6251) installed. For checking with camshaft removed,
refer to service procedure, Cam Lobe Lift (Camshaft
Removed) in this section.
Check the lift of each lobe in
make a note of the readings.
consecutive order and
1.
2.
3.
4.
5.
6.
7.
8.
Remove valve cover (6582) as outlined in
Section 02.
Remove spark plugs (12405) as outlined in
Section 02.
Inspect the camshaft lobes for scoring and signs
of abnormal wear.
Lobe pitting, except in the general area of the
lobe toe, is not detrimental to the operation of the
camshaft. The camshaft should not be replaced
unless lobe lift loss has exceeded the
specifications or pitting has occurred in the lobe
lift area.
Inspect for signs of camshaft bearing wear.
Using ratchet handle and socket on vibration
damper bolt, rotate engine so cylinder number
one exhaust valve is fully open (heel of cam at
top).
Install TOOL-4201-C, or equivalent, Dial Indicator
with Bracketry, so tip of dial indicator is on heel of
cam.
Zero dial indicator.
Slowly rotate engine until tip of dial indicator is on
tip of cam and read. This is cam lift.
9.
Write down cam lift and repeat for the rest of the
cam lobes. If any lobe' s lift is below the minimum
lift specified in Section 02, replace the camshaft.
Hydraulic Valve Tappet/Lash Adjuster
The hydraulic lash adjusters used in the overhead cam
2.3L engine are zero-lash hydraulic devices similar in
construction and operation to the hydraulic valve
tappets (6500) used on push rod engines. They are
cleaned, inspected and checked in the same manner
as hydraulic valve tappets The instructions below
apply equally to the lash adjuster and the valve tappet.
Hydraulic tappet noise may be caused by any of the
following:
1. Excessive collapsed tappet gap
2.
Sticking tappet plunger
3.
Tappet check valve not functioning properly
4.
Air in lubrication system
5.
Leak-down rate too rapid
6.
Excessive valve guide wear
Excessive collapsed tappet gap may be caused by
loose valve train parts such as wear of tappet face,
worn roller finger follower (6529), or worn valve tip.
With valve tappet (6500) collapsed, check gap
between valve tip and roller finger follower to
determine if any other valve train parts are damaged,
or worn. Replace any worn or damaged parts.
A sticking tappet plunger may be caused by dirt, chips,
or varnish inside the tappet. The sticking can be
corrected by disassembling the valve tappet and
removing the dirt, chips or varnish that are causing the
condition.
A tappet check valve that is not functional may be
caused by an obstruction such as dirt or chips
preventing it from closing when operated, or it may be
caused by a broken check valve spring within the
tappet.
Air bubbles in the lubrication system will prevent the
valve tappet from supporting the valve spring load and
may be caused by an oil level that is too high or too
low, or by air being drawn into the system through a
hole, crack or leaking gasket on the oil pump screen
cover and tube (6622).
If the leakdown time is below the specified time for
used valve tappets, noisy operation may result. If no
other cause for noisy valve tappets can be found, the
leakdown rate should be checked, and any outside the
specification should be replaced.
Camshaft End Play
CAUTION: Prying against the camshaft sprocket
(6256) with valve train load on the camshaft
(6251), can break or damage the camshaft
sprocket. Therefore, on 2.3L engines, remove the
cam followers as outlined in Section 02.
After checking camshaft end play, reinstall or retighten
valve train components as outlined in Section 02.