Engine - Intermittent Valve Train Noise
90chrysler09 Models1990 AA, AC, AG, AJ, AS Bodies
Subject
3.0L Engine Intermittent Valve Train Ticking Noise Hot Or Cold
Index
ENGINE
Date
June 18, 1990
No.
09-02-90 (C09-01-0)
P-1785
BODY CODE LEGEND
AA - ACCLAIM/SPIRIT/LEBARON
AC - DYNASTY/NEW YORKER LANDAU/SALON
AG - DAYTONA
AJ - LEBARON COUPE/LEBARON CONVERTIBLE
AS - CARAVAN/GRAND CARAVAN/CARAVAN C/V
VOYAGER/GRAND VOYAGER/TOWN & COUNTRY
SYMPTOM/CONDITION
Some 1990 3.0L engines built before engine code 7-370 may exhibit a valve train ticking noise. This noise can occur when the engine is cold and/or at operating temperature. This condition may be the result of a rocker arm casting burr in the area of the rocker arm shaft bore.
Figure 1:
DIAGNOSIS
With the engine running, use a stethoscope to pinpoint the noise location by listening at the right and left (front and rear) cylinder head covers. Turn the engine off, and remove the appropriate cylinder head cover. Carefully move the rocker arms, one at a time, away from the cam shaft bearing cap. Inspect the rocker arm surface that contacts the cam shaft bearing cap for casting burrs as shown in Figure 1. If casting burrs are found, perform the repair procedure listed below.
NOTE: THE ENGINE WILL NEED TO BE ROTATED TO ALLOW THE VALVES IN THE OPEN POSITION TO CLOSE BEFORE THE ROCKER ARM CAN BE MOVED OVER FOR INSPECTION.
If no casting burrs are found, perform the valve lash adjuster noise diagnosis as outlined in the appropriate Service Manual.
REPAIR PROCEDURE
This repair involves the removal of the rocker arm assembly, removal of the rocker arms from the shaft and removing the casting burr from the rocker arm(s).
NOTE: TO PREVENT DAMAGING THE CAMSHAFT SEAL, CAMSHAFT BEARING SURFACES OR CAMSHAFT JUMPING TIME THE FOLLOWING CAMSHAFT HOLD DOWN TOOL SHOULD BE FABRICATED AND POSITIONED ON THE REAR OF THE CAMSHAFT BEFORE REMOVING THE ROCKER ASSEMBLY:
PARTS REQUIRED TO FABRICATE CAMSHAFT HOLD DOWN TOOL
1-5/16" x 2 1/2" Bolt (such as PN S0181622)
1-1/2" Flat Washer (such as PN J4004134)
1 Tie Strap (such as PN 06016155)
1 M8 x 35 MM Bolt (such as PN 34201936)
Figure 2:
1. Carefully grind down the circumference at the end of the 5/16" bolt until it fits snugly in the hole at the rear of the camshaft, Figure 2.
Figure 3:
2. Install the 1/2" washer on the bolt and install the bolt in the hole in the rear of the camshaft. Feed the tie strap through the washer and attach to the engine as follows:
Front (left) cylinder head, route strap around exhaust pipe and pull strap tight, Figure 3.
Figure 4:
Rear (right) cylinder head, install the MB Bolt on rear of the block, route strap around the bolt and pull strap tight, Figure 4.
1. Remove and disassemble the rocker arm assembly as outlined in the appropriate Service Manual.
2. Using an oilstone or 500 wet/dry sandpaper soaked in oil, remove the casting burr from the rocker arm. The rocker arm surface should be smooth and free of burrs.
3. Thoroughly clean the rocker arm to remove all traces of the abrasive material.
4. Clean the rocker arms and rocker shafts and reassemble as outlined in the appropriate Service Manual.
5. Install the rocker arm assembly.
6. Tighten the rocker arm bearing cap bolts to 10 N-m (85 in.lbs) torque in the sequence outlined in the appropriate Service Manual.
7. Remove the camshaft hold down tool.
8. Install the cylinder head cover.
POLICY: Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No.
Front head one rocker arm 09-80-01-91 1.0 Hrs.
Rear head one rocker arm 09-80-01-92 1.2 Hrs.
Both heads one rocker arm 09-80-01-93 1.9 Hrs.
Each additional rocker arm 09-80-01-94 0.2 Hrs.
FAILURE CODE: 68 - Noisy