| The following technical bulletins were published by AERA. |
| | DAMPER CHANGE INTERVALS | Vibration Damper Change Intervals On
Cummins Engines
Cummins Engine Co. reported that vibration dampers should be replaced in all engine families at the following intervals even if the damper meets all inspection criteria:
Recommended Change Interval
Damper Automotive Off-Highway
Engine Model Type (Miles) (Hours)
V/VT-378,504,555 Rubber 360,000 15,000
V/VT/VTA-903 Rubber 360,000 15,000
N/NT-855 Rubber 360,000 15,000
N/NT/NTA-855 Viscous 360,000 15,000
KT-1150 Rubber 360,000 15,000
KT/KTA-1150 Viscous 360,000 15,000
V/VT/VTA-1710 Rubber 24,000
KT/KTA-2300,3067 Viscous 24,000
L-10 Viscous Major Overhaul* Major Overhaul*
* If the gear cover is removed and the damper has more than 300,000 miles or 12,000 hours, the damper should be replaced.
The AERA Technical Committee | | HEAD GASKET SELECTION FOR 1.9L DIESEL | Head Gasket Selection For
1982-99 Peugeot 1.9L XUD9 Diesel Engines
The AERA Technical Committee offers the following information for the head gasket selection for the 1982-99 Peugeot XUD9 diesel engines. This information should be considered anytime head gasket replacement is occurring.
Four different head gasket thickness options are currently available and they replace all previous head gasket selections. These gaskets provide a greater variety of gasket thickness options to choose from. Selecting the correct replacement head gasket will ensure proper engine specifications are maintained during engine repairs.
Selecting a replacement head gasket requires measuring the amount of piston protrusion above the deck of the block. After determining the piston height, select the appropriate replacement gasket from the chart below. The gaskets are further identified by a different number of notches on one end of each gasket.
Note: The charts in the original service manuals are no longer valid.
Part # Piston Protrusion Gasket thickness Notches
94-8132 .56mm-.0220/ .71mm-.0279 1.48mm-.0580 2
94-8133 .71mm-.0279/ .75mm-.0295 1.52mm-.0600 3
94-8134 .75mm-.0295/ .79mm-.0311 1.58mm-.0620 4
94-8135 .79mm-.0311/ .83mm-.0326 1.62mm-.0637 5
Add this chart to older Peugeot service and overhaul manuals (if applicable) and this information should also be used on Toro Reelmaster® 335-D/3500-D and Groundsmaster® 455-D units.
The AERA Technical Committee | | REAR MAIN CRANKSHAFT SEAL IDENTIFICATION/SELECTION | Rear Main Crankshaft Seal Selection On
1980-89 GM 2.8L (173 CID) Engines
There has been much discussion on the appropriate rear main
crankshaft seal that should be used on 1980-89 GM 2.8L (173 CID)
engines used by most General Motors divisions. Even AMC/Jeep
used the 2.8L as the alternate engine in some of their light duty
trucks. Rear main seal selection is especially critical since
there are so many crankshaft and cylinder block combinations.
Furthermore, some crankshaft's seal surfaces are knurled, while
others are smooth.
Model Crankshaft Main Seal
Year Casting No Jrn'l Size Surface Seal Description
80-84 504 Small Knurled Internal rope type
Internal two piece
81-85 504 Small Smooth Internal 5.5mm
one piece *
85-87 817 Large Smooth External 11mm one piece
87-89 526 Large Smooth External 11mm one piece
87-89 481 Large Smooth External 11mm one piece
* Some aftermarket gasket/seal manufacturers are also suggesting
the 5.5mm one piece rear seal on knurled 504 crankshafts with
equal success.
For additional information see AERA Technical Bulletins: TB 599 &
SPB 97R
The AERA Technical Committee
March 1991 - TB 750
##END## | | REVISED CUMMINS SMALL CAM V8 CAMSHAFT & BEARINGS | Camshaft & Bearing Changes On
Cummins Small Cam V8 Engines
The Cummins Engine Company has introduced a revised camshaft and camshaft bearings for its V/VT-504 & V/VT-555 small cam engines.
The Cummins small cam engines carry a camshaft bearing housing bore of 2.187. The revised camshaft is no longer cross drilled and requires new camshaft bearings. The new camshaft bearings feature a wider groove and supersede all previously used bearings.
For V8 engines with 2.187 camshaft housing bores, use Cummins part #3278345 for positions 1 & 5. Use camshaft bearing part #3031037 for positions 2, 3 & 4. These new camshaft bearings may be used in conjunction with either the revised or the former design camshaft. Do not use earlier camshaft bearings with the late model camshafts.
The AERA Technical Committee | | CONNECTING ROD IDENTIFICATION FOR CUMMINS ENGINES | Connecting Rod Identification For
Cummins Engines
The AERA Technical Committee offers the following information on connecting rod identification for 1950-2002 Cummins diesel engines. Throughout the years of manufacturing there have been different connecting rod designs used for a particular engine series. This bulletin should be used to help differentiate those changes by visual inspection and casting number reference.
Engine Model Forging Number Pin End Type
V/VT 1710 190128* 180097 Taper
KT/KTA 19 3000791 New Style
205116 Old Style
KT/KTA 38/50 3000573, 3053184 New Style
3628663, 3630023
QSK 3811994 Taper
V-555 554335 Taper Non-Drilled
VT-225 554336 Taper Drilled
V-378/V-504 166452, 3012355 Taper
V-903 189761 Taper
NH 121430 Taper
NH 121579 Taper
N-NH 101158 Straight
NH 5 ? (Big Cam) 218808 Taper
91N14 3064292 Taper
94N14 3078325, 3078328 Taper
3078329
Signature 600 3685707 Taper
B Series 3901566 Taper
ISB Taper
C Series 3901247 Taper
L10 3027104 Taper Drilled
3820301 Taper Non-Drilled
M11 3079629 No balance slug On small end
96M11 3079629 Taper Drilled
* NOTE: Forging 190128 is machined on side of crankpin end to allow cylinder liner clearance. Forging 180097 has not been machined for that purpose.
The AERA Technical Committee | | CYL BLOCK SPECIFICATIONS ON V-504 ENGINES | Cylinder Block Specifications On
Cummins V-504 Series Diesel Engines
The Cummins Engine Company has released the following cylinder block specifications for V-504 series diesel engines. Refer to the chart and illustrations below while rebuilding the block.
Description Specification Illustration Mark
Cylinder block weight 375 lbs.
170 kg.
Total height when 16.800 A
tilted 427.00mm
Total width when tilted 16.800 B
427.00mm
C/Main to outer pan 6.650 C
rail 169.00mm
C/Main to outer head 10.15 D
deck 258.00mm
Cyl. head deck surface 9.20 E
width 234.00mm
Cyl. head deck surface 26.30 F
length 668.00mm
Angle of Vee 90° ± 15' G
Cyl. block deck height 8.266-8.277 H
from outside diameter 209.96-210.24mm
of main bearing bore to deck surface
Cyl. block deck height 10.142-10.153 J
from centerline of main 257.61-257.89mm
bearing housing bore to deck surface
Surfacing the cylinder block may require the use of a thicker cylinder head gasket. If less than .006 is removed, use the standard head gasket, Cummins Part #3017062. If between .006 and .015 is removed, use gasket Part
#AR62074. If between .016 and .020 is removed, use gasket Part #AR62075.
The block deck height parallelism from end to end should not vary more than .002 per 20 of block length. The side to side flatness should not vary by more than .001 in any 10 span. The block deck height should not vary by more than
.0004 from bank to bank. The recommended surface finish for this block deck should be 125 micro/inch or 3.18 m/meter.
The AERA Technical Committee |
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