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FRONT END ENGINE NOISE ON 1992-94 2.4L KA24E |
Front End Engine Noise On
1991-94 Nissan 2.4L KA24E Engines
The AERA Technical Committee offers the following information regarding a noise located at the engine front on 1991-94 Nissan 2.4L KA24E engines. These engines are used in the Sentra and Pickup models and they utilize a single overhead camshaft driven by a long timing chain. This noise seems to be emanating from that assembly area.
The cause of this condition is an excessively loose timing chain, which has resulted from the chain tensioner plunger sticking in the plunger bore. The plunger involved was a new component and did not exhibit this sticking condition before it was mounted to the engine block. Apparently, the tensioner body distorted enough to stick the plunger even though the correct mounting bolt torque values were used. In several instances just loosening the bolt allowed the plunger to move. These tensioner assembly mounting bolts require only minimal torque of 61-70 in/lbs.
Too small of a mounting bolt hole diameter on the replacement tensioner allowed distortion in the plunger bore and caused the plunger to stick. Increasing the bolt hole diameter to a similar diameter as the original tensioner, resolved the plunger sticking problem.
The AERA Technical Committee |
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INTERFERENCE ENGINES |
Interference Engines
The AERA Technical Committee would like to offer the following information on engines that present the possibility of interference between pistons and valves. The interference or contact may bend valve(s) when the timing between the camshaft and crankshaft is interrupted. This is generally the result of a timing belt or chain breaking or slipping.
The following list are engines that AERA is currently aware of that have exhibited interference. There may be other engines that are not listed below that have the possibility of piston to valve contact. If the engine you are working on is not listed, do not assume that it is a freewheeling design. It is suggested to add to this listing as additional information is obtained.
ACURA
1986-89 1.6L Integra
1991-95 1.7L Integra
1990-95 1.8L Integra
1986-89 2.5L Legend
1992-94 2.5L Vigor
1986-89 2.7L Legend
1990 2.7L Legend
1991-95 3.0L NSX
1991-95 3.2L Legend
AUDI
1970-93 All Except 1970-77
1.9L & 1970-73 1.8L
BMW
1987-95 2.5L 325I 525I
1994-95 4.0L 740I
CHRYSLER
1993-95 1.5L Colt
1987-88 1.5L Colt
1992-95 1.5L Eagle Summit
1987-88 1.6L Colt
1989-92 1.6L Eagle Summit
1994-98 2.0L Neon Stratus
1990-95 2.0L Eagle Talon
DAIHATSU
1988-92 1.0L Charade
1988-92 1.3L Charade
1990-92 1.6L Rocky
FIAT
1974-79 1.3L 128 Series
1979-82 1.5L Stranda
1974-78 1.6L 124 Series
1974-78 1.8L 124 Series
1974-78 1.8L 131 Series, Brava
1979-82 2.0L Brava, Spider
FORD
1981-85 1.6L Escort, EXP
1981-83 1.6L LN7, Lynx
1984-85 2.0L Escort, Tempo
1993-95 2.0L Probe
1986-88 2.0L Ranger
1984-87 2.0L Lynx, Topaz Diesel
1985 2.2L Ranger
1989-92 2.2L Probe
1986-88 2.3L Ranger
1986-87 2.3L Diesel Ranger
1991-98 4.6L Crown Victoria
GM
1986-95 1.0L Geo Metro
1989-91 1.0L Firefly (CANADA)
1985-88 1.5L Sunburst (CANADA)
1985-89 1.5L Spectrum
1990-93 1.6L Prizm, Storm
1981-84 1.8L Diesel (CANADA)
1982-86 1.8L Buick Skyhawk
1990-98 1.9L Saturn
1987-88 2.0L Buick Skyhawk
1988-95 2.3L Quad Four
1985-87 3.0L Buick
1979-95 3.8L Buick
HONDA
1986-87 1.0L Prelude
1973-78 1.2L All
1973-78 1.3L All
1980-84 1.3L All
1973-78 1.5L All
1985-89 1.5L Civic
1988-95 1.5L Civic, CRX
1993-95 1.5L Civic Del Sol
1979-84 1.5L All
1985-87 1.5L CRX
1993-95 1.6L Civic Del Sol
1973-78 1.6L All
1980-82 1.6L All
1988-95 1.6L Civic, CRX
1984-87 1.8L Prelude, Accord
1979-83 1.8L All
1986-91 2.0L Prelude
1990-91 2.1L Prelude
1990-95 2.2L Prelude, Accord
1992-95 2.2L Prelude
1995 2.7L Accord
HYUNDAI
1984-95 1.5L Excel Scoupe
1995-98 1.5L Accent
1992-95 1.6L Elantra
1993-95 1.8L Elantra
1992-95 2.0L Sonata
1989-91 2.4L Sonata
1990-95 3.0L Sonata
INFINITI
1990-92 3.0L M30
ISUZU
1987-89 1.5L I-Mark
1990-93 1.6L Stylus Impulse
1987-89 2.0L Impulse
1981-87 2.2L Diesel Truck
1986-95 2.3L Truck Trooper
1988-95 2.6L Truck Rodeo Amigo
1991-96 3.2L Trooper Rodeo Amigo
KIA
1995 2.0L Sportage
MAZDA
1984-85 2.0L 626
1988-92 2.2L 626 MX6
1989-93 2.2L Pickup
1988-95 3.0L 929 MPV
MITSUBISHI
1985-95 1.5L Mirage Precise
1990-92 1.6L Mirage
1989-95 2.0L Galant Eclipse
1983-86 2.3L Diesel Pickup
1994-95 2.4L Galant
NISSAN
1982 1.5L Centra
1983-88 1.6L Sentra Pulsar
1987-89 1.8L Pulsar
1982-89 2.0L Stanza 300ZX
1984-95 3.0L Maxima 300ZX Pathfinder
PORSCHE
1976-83 2.0L 924
1976-89 2.5L 944 Series
1989 2.7L 944 Series
1989-91 3.0L 944 Series
1976-83 4.5L 928
1984 4.7L 928
1985-91 5.0L 928
1992-95 5.4L 928
SUZUKI
1985-94 1.3L Samurai Sidekick
1989-94 1.3L Swift
TOYOTA
1986-95 1.5L Tercel
1981-83 2.2L Pickup
1984-87 2.4L Pickup
1982-88 2.8L Celica Cressida
1987-94 3.0L 4-Runner
VOLKSWAGEN
1976-91 All Except 1.9 2.1L Engine
1990-92 1.6L Golf (CANADA) Jetta
1990-95 2.0L GTI Jetta GLI Passat
VOLVO
1991 2.3L Coupe 940
1986-94 2.3L 240 740 940
The AERA Technical Committee |
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REVISED CYL HEAD & BLOCK ON 1987-UP ENGINES |
Revised Cylinder Head & Block On
1987-Up Nissan 3.0L (VG30) Engines
Beginning with April, 1987 production, the cylinder heads and
block have been changed on Nissan 3.0L (VG30) engines.
Improvements were made to increase power output and decrease
noise levels of the engine.
Revised production engines can be identified by an engine serial
number that ends in W, such as XXXXXX W. Former engine serial
numbers end in either A or B. However, factory service
cylinder blocks will not carry the W identification even though
they feature the improvements listed below. A visual check is
necessary for proper identification.
Six new water galleries were added to the cylinder block (Figure
1) and the cylinder heads (Figure 2). This change required a
modification of the cylinder head gasket, where the original 6
water holes were downsized and 3 new holes added on the exhaust
side of the gasket (Figure 3). The revised cylinder head gasket
can also be identified by its differing identification tab.
Figure 4 best illustrates the former and revised head gaskets.
Additional changes were made throughout the engine. The pistons
now use full floating, larger diameter wrist pins. The small end
bore of the connecting rod was increased to accept the larger
wrist pin. The revised rod is also heavier than the former part.
Again, components are identified by a W stamp.
Nissan advises against the use of former parts when servicing
vehicles with engines manufactured as of April 1987. Refer to
the chart to determine the proper component combination when
servicing engines manufactured prior to April 1987 (Figure 5).
For additional information see AERA Technical Bulletins: TB 601,
653 & 752
The AERA Technical Committee
Cylinder Head Cylinder Short Acceptable
Head Gasket Block Block Combination
Revised Former Former N/A Yes
Former Former Revised N/A Yes
Former Former Former N/A Yes
Revised Revised Revised N/A Yes
Revised Former Revised N/A Yes
Revised Revised Former N/A No
Former Revised Revised N/A No
Former Revised Former N/A No
Former Former N/A Revised Yes
Revised Revised N/A Revised Yes
Revised Former N/A Revised Yes
Former Revised N/A Revised No
April 1991 - TB 761
##END## |
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REVISED CRANKSHAFT |
Revised Crankshaft On
1984-87 Nissan VG30 Engines
Nissan has revised the snout of the crankshaft and related
service parts for VG30 engines manufactured after April 1987.
Since only the revised crankshaft is being serviced by Nissan,
should it become necessary to use this crankshaft in 1984-1987
engines, several associated parts also need to be changed.
Engines manufactured prior to April 1987 carry a serial number
that ends in either 'A' or 'B'.
Component Prior to As of
Description April 1987 April 1987
Crankshaft 12201-02P80 1 12201-02P81 2
Bolt Spacer Not Required 12308-V5321
Crank Pulley Bolt Washer 12308-V5000 3 12308-77A00
12308-V5001 3
12308-V5010 3
Crank Pulley Bolt 12309-V5000 12309-16V00
1 Does not include crankshaft pulley bolt washer or
crankshaft pulley bolt.
2 Includes crankshaft bolt spacer, crankshaft pulley bolt and
crankshaft pulley bolt washer.
3 Complete application information available on parts
microfiche
The front pulley assembly is the same for either crankshaft.
The AERA Technical Committee
March 1991 - TB 752
##END## |
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REVISED TIMING COMPONENTS |
Revised Timing Components On
1988 Nissan Z24I Engines
Nissan has revised the timing components used in 1988 and later Z24I engines. The actual production change was instituted in January of 1988.
The chain assembly was updated from a single roller to a double roller type. This update requires a new crankshaft and camshaft sprocket as well as the new double roller chain. The tensioner assembly and chain guides have not been changed. Engines manufactured prior to January 1988 may be serviced with the new components as long as all three pieces are used.
The AERA Technical Committee |
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LOOSE OIL PUMP PICKUP SCREENS |
Loose Oil Pump Pickup Screen On
GM 2.8L (173 CID) Engines
Reuse of the oil pump pickup screen on GM 2.8L (173 CID) engines may result in low engine oil pressure and related problems.
The OE oil pump for this engine is manufactured out of aluminum whereas most aftermarket oil pumps are manufactured out of traditional cast iron. Removing the oil pump pickup screen, cleaning it and then reinstalling it in an aftermarket oil pump may result in a loose fit.
Apparently, the diameter of the opening that accepts the pickup screen in the aluminum pump is smaller than in the cast iron counterpart. This tight fit shrinks the diameter of the pickup screen, but is necessary because of the differing expansion rates between the aluminum oil pump housing and the steel pickup
screen. Reusing the same screen in a cast iron pump that does not require this much interference fit, and therefore features a slightly larger bore, may result in an undesirable loose fit of the screen. This could draw air into the lubricating oil system causing low oil pressure, valve train noise and lead to serious
engine damage.
The AERA Technical Committee recommends the replacement of all oil pump pickup screens as part of the remanufacturing process on light duty engines.
For additional information see AERA Bulletins: TB 680, TB 439 & SB 140
The AERA Technical Committee |
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CYLINDER HEAD CRACKS |
Cylinder Head Cracks On
1983-86 GM 2.0L (121 CID) Engines
AERA member machine shops have reported cracking of the cylinder
heads of 1983-86 GM 2.0L (121 CID) engines. Complaints of coolant in the engine oil may be a futher indication.
This engine joined the GM lineup in 1983 and featured a cast iron cylinder head assembly through the 1986 model year. The engine has been used in the J cars as well as S-10 pickup trucks. As of the 1987 model year the cylinder head is now manufactured out of aluminum.
Cracks have been noticed in the cast iron cylinder head near the valve spring seats at the top of the casting. Usually cracks develop across the #6 intake valve spring seat and continue across and behind the #4 and #5 exhaust valve spring seat. Magnetic particle inspection should be used to determine the
extent of the crack and what repairs, if any, may be performed.
A neglected cooling system may deteriorate the casting where a small amount of stress will induce cracks. Cracks may also be caused by engine freeze up, overheating, or disassembly of the engine without adequate cool down.
The AERA Technical Committee |
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SEIZED CAMSHAFTS |
Seized Camshafts On
Nissan SOHC VG30 3.0L Engines
AERA has received reports of sudden camshaft seizures on Nissan SOHC VG30 3.0L engines. This seizure is uncommon because the cause of the failure is a broken cylinder head bolt. The head of the bolt breaks off and then becomes lodged under one of the cam lobes, resulting in the timing belt either breaking or stripping.
If this type of failure occurs, removal of valve covers will reveal that the bolt head is lodged underneath the camshaft. Further engine disassembly is now necessary as this is a non-freewheeling engine. Bent valves can be encountered on both cylinder banks, even if only one camshaft as seized.
For additional information see AERA Technical Bulletin: TB 601 &
TB 653
The AERA Technical Committee |
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TIMING CHAIN GUIDE ELIMINATION |
Timing Chain Guide Elimination On
1991-93 1.6L DOHC Nissan Engines
The AERA Technical Committee has received information concerning the elimination of two timing chain guides on 1991-93 1.6L DOHC engines. Beginning with engines produced in March 1993, the top and left side timing chain guides were eliminated.
All replacement cylinder heads Part #11040-57Y01, will not have the drilled holes to attach the chain guides. Those guides are not necessary and may cause an undesirable rattling noise when the timing chain contacts the guide. To prevent a possible noise complaint, Nissan suggests removing the two guides shown in the illustrations below anytime cylinder head repair is done.
The AERA Technical Committee |
