Tech Info For Servicing Parts – UnderhoodService

Tech Info For Servicing Parts

Central Port Fuel Injection Diagnosis

pg 42 What’s That Noise? Ticking Sound on Some Chrysler 3.2L and 3.5L Engines If a customer complains of a ticking noise on a Chrysler 3.2L and 3.5L engine (or any 1998-2004 Chrysler 3.2L and 3.5L VIN J, G, K, M and V engines), the AERA Technical Committee says this noise is usually associated only with cold start-up and generally lasts for just two to three seconds. The cause of this noise may be related to the associated movement between the exhaust swivel pad, retainer and rocker arm. To help reduce the likelihood of this type of ticking sound, revised components are available. This information applies only to exhaust locations, which are different than intake assemblies. The exhaust adjuster, rocker arm swivel kit is available as P/N 05135237aa. It is important to note that this repair may be made on the vehicle. If this repair has already been made on a particular engine, the swivel pad retainers will be colored blue and the swivel pads will be copper in color on the exhaust rocker arm assembly. The revised components are different than the original components. 1. Remove the rocker arm assembly bolts. 2. Remove the exhaust rocker arm assemblies. Note: To prevent air ingestion into lash adjusters, avoid turning the rocker arm assembly upside down or placing pressure on the lash adjuster. 3. Remove the retainers and swivel pads from each exhaust rocker arm (Figure 1). Remember, this bulletin only applies to the exhaust rocker arms. Do not install these new parts in the intake as damage may occur. 4. Install the new swivel pads and swivel pad retainers on all exhaust rocker arms (see Figure 2). Note: Do not reuse the original yellow retainers. Replace all exhaust swivel pads and retainers as a set. 5. Install the rocker arm assemblies and torque the rocker shaft mounting bolts to 275 in.-lbs (31 Nm). Honda Ticking Noise From The Engine A ticking noise may come from the V6 engine of 1994-’97 Passports during normal operation. According to Honda, the probable cause is one or more hydraulic lash adjusters (HLAs) does not fully extend due to varnish buildup inside. This condition results from exceeding the required oil and filter change schedule. See the appropriate Passport owner’s manual for details. Repair Procedure 1. Drain the engine oil, replace the oil filter with P/N 15400-P0H-305, and refill the crankcase with 0W-30 Mobil 1 synthetic engine oil. Note: Although the current recommended Passport V6 engine oil is 10W-30 API SJ, the 0W-30 oil allows air in the HLA(s) to bleed out quickly and removes the varnish that is preventing HLA piston travel. 2. With the engine warm, run it at 2,500 rpm for 30 minutes. • If the ticking noise goes away, return the vehicle to the customer. • If the ticking noise persists, continue with Step 3. 3. Allow the engine to idle until the ticking becomes loud and consistent. Use a stethoscope or long screwdriver to determine which bank is noisy, then stop the engine. 4. Remove the cylinder head cover on the noisy bank. 5. Check each rocker arm for clearance at the valve when the rocker is on the base circle of the cam and the valve is closed. (The rocker arms with clearance are the ones making noise.) See Figure 3 on page 44. Note: Each cylinder head has one oil pressure relief valve (P/N 8-94384-311-0) that controls oil pressure to its rocker arms. If all rocker arms on one cylinder head have clearance and/or the rocker arm pivot shaft is worn, the cylinder head oil pressure relief valve may be stuck open. Refer to page 6-17 of the appropriate Passport service manual for additional troubleshooting instructions. 6. Remove the ticking rocker arm assembly(s), and visually inspect the wear pattern of the HLA surface that contacts the valve stem. (The intake rocker arms [P/N 8-97084-929-1], located under the camshafts, require timing belt removal.) See Figure 4. 7. Using your fingers or soft-jaw pliers, remove the affected HLA(s) from the rocker arms. Be careful not to damage the O-ring on the outside of the HLA, or you will have to replace the entire rocker arm. (The HLA cannot be ordered separately.) When replacing an exhaust rocker arm, also replace its intermediate rocker arm. (Exhaust Rocker Arm (78C) (curves left): P/N 8-97032-013-1; Exhaust Rocker Arm (78D) (curves right): P/N 8-97032-014-1; and Intermediate Exhaust Rocker: P/N 8-97089-270-2) 8. Insert a paper clip into the hole at the top of the HLA, and depress the spring-loaded check ball while completely pushing in the piston at the opposite end. The oil inside the HLA will come out of the check ball hole. See Figure 5. 9. Carefully remove and retain the HLA O-ring, then with the HLA piston compressed, spray the piston end with carburetor cleaner to remove any varnish. Continue to spray the HLA until the runoff is clear, and the HLA piston compresses and extends freely. 10. Submerge the HLA in a cup of new cleaning solvent. While depressing the check ball, compress and release the piston several times to pump the solvent through the HLA. 11. Submerge the HLA in a cup of clean 0W-30 Mobil 1 engine oil, and pump oil through the HLA in the same manner as in Step 10. Finish up by allowing the spring inside the HLA to fully extend the piston. This fills the HLA with oil. 12. Reinstall the HLA O-ring. 13. Lube the rocker arm bore that houses the HLA with engine oil, then push the HLA back into place. 14. Check for leaks at the check ball and piston by attempting to compress the HLA piston without depressing the check ball. (The HLA should not compress or leak when full of oil.) Note: An oil-filled HLA will hold its valve off the seat for several crank revolutions. This may cause the engine to run rough for a short period after starting. If all of the HLAs (of all rockers and all cylinders) are filled to maximum extension, low compression will require a long cranking time. To prevent this, select one cylinder and bleed off some oil (depress the check ball and compress the piston approximately 1/4 of the way down) after filling those four HLAs. This will allow the valve to close. Do not remove all of the oil or the valve spring and cam will collapse the HLA permanently. 15. Reassemble the engine using new cylinder head cover gaskets (P/N 15400-PR3-004). Apply Hondabond HT (P/N 08718-0001) at the corners where the cam tower, gasket and cylinder head meet. Torque the cylinder head cover bolts to 8 Nm (69 lb.-in.) using hand tools only. 16. Start the engine and listen for noise. 17. Remind the customer that varnish accumulation can be prevented with more frequent engine oil changes in accordance with their driving habits. An oil rated a minimum of API Service SG should be used. The current API service rating of SJ is preferred. Source: Honda Parts Express s cap Figure 1: Rocker arm assembly for 1998-2002 Chrysler 3.2L and 3.5L engines. Noise complaints may be due to the associated movement between the exhaust swivel pad, retainer and rocker arm. Figure 2: Rocker arm and stud location on 1998-2002 Chrysler 3.2L and 3.5L engines.

You May Also Like

Alternator Testing For No Charge Conditions

Many alternator problems turn out to be nothing more than a bad connection at the alternator or a bad wiring harness.

If only battery voltage is present at the battery on a running engine, does this mean the alternator is “bad?” No, it does not. It only means that the alternator is not charging, but does not reveal why. Therefore, it does not point to a faulty alternator. All too often, the alternator is condemned by technicians due to this test alone. The cause could instead be a module that distributes the power to the vehicle and regulates the alternator.

Lifter Deactivation

The area of contact between the lifters and cam lobes is the highest loaded surface inside an engine.

Battery Charging and Diagnostics

Here are six tips to use when diagnosing a vehicle with a dead battery. 

Diagnosing Crankshaft Position Sensors

Modern engines need to not only know the position of the crankshaft, but the position of the camshafts.

Electronic Throttle Body Service

On most systems, idle speed is completely controlled by the throttle plate angle.

Other Posts

Diagnosing Misfires

What if there are no codes and a misfire is intermittent? This is where it gets complicated.

Spark Plug Evolution

Spark plugs have changed over the years.

How Speed, Load and Slip Affect Voltages

Modern, computer-controlled charging systems found on today’s vehicles need proper test procedures – no guesswork allowed.

Valve Lifter Technology

Hydraulic lifters are precision-fit assemblies.