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OIL STARVATION OF THE CYLINDER HEAD | Oil Starvation Of The Cylinder Head On
1986-89 Acura 1.6L Engines
AERA machine shop personnel are reminded to thoroughly clean the vertical oil passage in the cylinder block when rebuilding 1986-89 Acura 1.6L engines. This engine also uses an oil control jet at the block deck in that vertical oil gallery. It too must be removed, cleaned and free of obstructions. Note that the opening of the control valve is only .040 (1.02 mm) in diameter (see illustration).
Anytime the cylinder head is removed from the engine, the oil control jet needs to be removed from the gallery. Once removed the vertical gallery should be flushed from the lower oil supply gallery. Pressurized air will work if the engine has been disassembled. If the engine has not been removed from the vehicle, oil can be forced through the gallery by turning the engine with the starter. Be sure to install a new gasket under the control jet before positioning the cylinder head gasket and mounting the head.
Failure to reinstall the oil control valve will force too much oil into the cylinder head. This may render the valve seals ineffective or overwhelm the PCV system, causing excessive oil consumption.
The AERA Technical Committee | |
FLYWHEEL RESURFACING CAUTION | Flywheel Resurfacing Caution For Mack Trucks
Mack Trucks has established new wear limits for their flywheels. If a Mack flywheel requires resurfacing because of scoring, heat checks or distortion, the dimensions listed below and on the reverse side must be maintained. It should also be noted that flywheels that use ceramic clutch facings do not require resurfacing until .020 wear on the friction surface has been exceeded.
When resurfacing a flat style flywheel, it is very important not to alter the original undercut area at the outer friction face diameter. This area locates the clutch plate and may cause an imbalance if the pilot is altered. Most flywheels can be surfaced several times before the undercut is removed as shown in figure 1.
If the flywheel is resurfaced to a distance that removes the undercut, it must be re-established without altering the clutch pilot.
On pot-type flywheels, measure the distance between the flywheel friction surface and the clutch cover mounting surface, which is dimension D in the illustration below. This dimension must be re-established after the friction face is resurfaced. It is also recommended that flywheels that have balance holes on the clutch side should be balanced to within .50 inch ounce, after resurfacing.
Also, measure the distance between the flywheel friction surface and the flywheel mounting bolt surface (T dimension). If the distance is less than the minimum allowance, do not resurface the flywheel. The total maximum amount of stock which may be machined from the flywheel friction surface is .070.
Clutch Size Flywheel# Min. Dim. Nominal
Model CL Dia () 530GB T () D ()
---------------------------------------------------------------------------------------------------------
28 15 4275/4280/4288 1.086 1.589-1.599
40 14 4178/4249 0.742 1.589-1.599
47 14 4181 0.960 1.183-1.193
50 14-1/2 4316 1.274 2.792-2.802
14-1/2 4336 1.586 2.792-2.802
58 16-1/2 4326 1.112 1.657-1.667
16-1/2 4328 1.180 1.657-1.667
65 14 4319/397 1.212 2.932-2.942
14 4349 0.899 2.932-2.942
66 15-1/2 4381 1.211 Flat
15-1/2 394 0.899 Flat
67 14 4319/397 1.212 2.932-2.942
14 4349 0.899 2.932-2.942
14 4350 0.961 1.870-1.880
14 2219 0.961 1.870-1.880
68 14 4319/397 1.212 2.932-2.942
14 4349 0.899 2.932-2.942
14 4350/2219 0.961 1.870-1.880
69 14 4348/4319 1.212 2.932-2.942
14 4349 0.899 2.932-2.942
72 13-1/2 4358 1.352 Flat
13-1/2 4361 1.035 Flat
73 14 4319 1.212 2.932-2.942
14 4349 0.899 2.932-2.942
74 15-1/2 4381 1.211 Flat
15-1/2 394 0.899 Flat
75 14 4348/4319 1.212 2.932-2.942
14 4349 0.899 2.932-2.942
77 14 4348/4319 1.212 2.932-2.942
78 14 4348/4319 1.212 2.932-2.942
14 4349 0.899 2.932-2.942
79 15-1/2 394 0.899 Flat
15-1/2 524B 0.599 Flat
793/795 15-1/2 4391A 1.036 Flat
795 15-1/2 524C 0.599 Flat
796 15-1/2 4391A 1.036 Flat
797/798 15-1/2 4402 1.148 Flat
15-1/2 552/562 0.899 Flat
7991/7992 15-1/2 544M/544AM 1.066 Flat
81 15-1/2 394 0.899 Flat
82/83 14 4348/4319 1.212 2.932-2.942
84 14 3119/440 1.211 Flat
85/86 14 4348/4319 1.212 2.932-2.942
93(FWPTO) 15-1/2 4402 1.148 Flat
15-1/2 544M/544AM 1.066 Flat
The AERA Technical Committee | |
FLYWHEEL RESURFACING CAUTION | Flywheel Resurfacing Caution For Mack Trucks
Mack Trucks has established new wear limits for their flywheels. If a Mack flywheel requires resurfacing because of scoring, heat checks or distortion, the dimensions listed below and on the reverse side must be maintained. It should also be noted that flywheels that use ceramic clutch facings do not require resurfacing until .020 wear on the friction surface has been exceeded.
When resurfacing a flat style flywheel, it is very important not to alter the original undercut area at the outer friction face diameter. This area locates the clutch plate and may cause an imbalance if the pilot is altered. Most flywheels can be surfaced several times before the undercut is removed as shown in figure 1. If the flywheel is resurfaced to a distance that removes the undercut, it must be re-established without altering the clutch pilot.
Figure 1.
On pot-type flywheels, measure the distance between the flywheel friction surface and the clutch cover mounting surface, which is dimension D in the illustration below. This dimension must be re-established after the friction face is resurfaced. It is also recommended that flywheels that have balance holes on the clutch side should be balanced to within .50 inch ounce, after resurfacing.
Also, measure the distance between the flywheel friction surface and the flywheel mounting bolt surface (T dimension). If the distance is less than the minimum allowance, do not resurface the flywheel. The total maximum amount of stock which may be machined from the flywheel friction surface is .070.
Figure 2.
Clutch Size Flywheel# Min. Dim. Nominal
Model CL Dia () 530GB T () D ()
---------------------------------------------------------
28 15 4275/4280/4288 1.086 1.589-1.599
40 14 4178/4249 0.742 1.589-1.599
47 14 4181 0.960 1.183-1.193
50 14-1/2 4316 1.274 2.792-2.802
14-1/2 4336 1.586 2.792-2.802
58 16-1/2 4326 1.112 1.657-1.667
16-1/2 4328 1.180 1.657-1.667
65 14 4319/397 1.212 2.932-2.942
14 4349 0.899 2.932-2.942
66 15-1/2 4381 1.211 Flat
15-1/2 394 0.899 Flat
67 14 4319/397 1.212 2.932-2.942
14 4349 0.899 2.932-2.942
14 4350 0.961 1.870-1.880
14 2219 0.961 1.870-1.880
68 14 4319/397 1.212 2.932-2.942
14 4349 0.899 2.932-2.942
14 4350/2219 0.961 1.870-1.880
69 14 4348/4319 1.212 2.932-2.942
14 4349 0.899 2.932-2.942
72 13-1/2 4358 1.352 Flat
13-1/2 4361 1.035 Flat
73 14 4319 1.212 2.932-2.942
14 4349 0.899 2.932-2.942
74 15-1/2 4381 1.211 Flat
15-1/2 394 0.899 Flat
75 14 4348/4319 1.212 2.932-2.942
14 4349 0.899 2.932-2.942
77 14 4348/4319 1.212 2.932-2.942
78 14 4348/4319 1.212 2.932-2.942
14 4349 0.899 2.932-2.942
79 15-1/2 4381 1.211 Flat
15-1/2 394 0.899 Flat
15-1/2 524B 0.599 Flat
793/795 15-1/2 4391A 1.036 Flat
795 15-1/2 524C 0.599 Flat
796 15-1/2 4391A 1.036 Flat
797/798 15-1/2 4402 1.148 Flat
15-1/2 552/562 0.899 Flat
7991/7992 15-1/2 544M/544AM 1.066 Flat
81 15-1/2 394 0.899 Flat
82/83 14 4348/4319 1.212 2.932-2.942
84 14 3119/440 1.211 Flat
85/86 14 4348/4319 1.212 2.932-2.942
93(FWPTO) 15-1/2 4402 1.148 Flat
15-1/2 544M/544AM 1.066 Flat
Clutch Size Flywheel# Min. Dim.Nominal
Model CL Dia () 530GB T () D ()
28 15 4275/4280/42881.0861.589-1.599
40 14 4178/4249 0.7421.589-1.599
47 14 4181 0.9601.183-1.193
50 14-1/2 4316 1.2742.792-2.802
14-1/2 4336 1.5862.792-2.802
58 16-1/2 4326 1.1121.657-1.667
16-1/2 4328 1.1801.657-1.667
65 14 4319/397 1.2122.932-2.942
14 4349 0.8992.932-2.942
66 15-1/2 4381 1.211 Flat
15-1/2 394 0.899 Flat
67 14 4319/397 1.2122.932-2.942
14 4349 0.8992.932-2.942
14 4350 0.9611.870-1.880
14 2219 0.9611.870-1.880
68 14 4319/397 1.2122.932-2.942
14 4349 0.8992.932-2.942
14 4350/2219 0.9611.870-1.880
69 14 4348/4319 1.2122.932-2.942
14 4349 0.8992.932-2.942
72 13-1/2 4358 1.352 Flat
13-1/2 4361 1.035 Flat
73 14 4319 1.2122.932-2.942
14 4349 0.8992.932-2.942
74 15-1/2 4381 1.211 Flat
15-1/2 394 0.899 Flat
75 14 4348/4319 1.2122.932-2.942
14 4349 0.8992.932-2.942
77 14 4348/4319 1.2122.932-2.942
78 14 4348/4319 1.2122.932-2.942
14 4349 0.8992.932-2.942
79 15-1/2 4381 1.211 Flat
15-1/2 394 0.899 Flat
15-1/2 524B 0.599 Flat
793/795 15-1/2 4391A 1.036 Flat
795 15-1/2 524C 0.599 Flat
796 15-1/2 4391A 1.036 Flat
797/798 15-1/2 4402 1.148 Flat
15-1/2 552/562 0.899 Flat
7991/7992 15-1/2 544M/544AM 1.066 Flat
81 15-1/2 394 0.899 Flat
82/83/85/86 14 4348/4319 1.2122.932-2.942
84 14 3119/440 1.211 Flat
93(FWPTO) 15-1/2 4402 1.148 Flat
15-1/2 544M/544AM 1.066 Flat | |
SNAPPING NOISE ON 90-91 1.8L ENGINES | Snapping Noise On
1990-91 Acura 1.8L Engines
The AERA Technical Committee has been advised of a snapping noise on
1990-91 Acura 1.8L engines. The best description for this noise is a sharp snapping sound, similar to the sound of spark plug wire arcing. The cause for this unusual noise is not obvious, but may be uneven cylinder head torque.
Inappropriate torque may permit the cylinder head to move as the engine reaches operating temperature. If this noise is detected and o other cause can be found, verify the cylinder head bolt torque with this procedure:
1. Allow the engine to completely cool and remove both camshafts.
2. In reverse sequence loosen cylinder head mounting bolts, one bolt at a
time, then torque each bolt immediately to 7 ft. lbs.
3. After all bolts have been tightened to 7 ft. lbs. in sequence, tighten all
bolts to 22 ft. lbs. Finally, advance the head bolt torque to 43 ft. lbs,
then 61 ft. lbs.
4. Reinstall the camshafts and adjust valve clearance to .006 for intake
valves and .007 for exhaust valves.
The AERA Technical Committee |
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