| Subject: | Engine Identification Information |
| Models: | 2003 and Prior Passenger Cars and Trucks |
| with North American Engines |
This bulletin covers the location of the engine identification information
for OEM, service, Goodwrench® and remanufactured engines. The OEM information
is a paper bar code tag attached to the engine. The Goodwrench® information
is on a metal tag attached to the engine.
OEM Identification Information
The engine bar code tag is usually in one of several places. The bar
code tag could be on a rocker arm cover, the ends of a cylinder head or on
the oil pan or the oil rail area of the engine. The information required from
the tag is the 3 position alpha-numeric code which identifies the model of
the engine and the series of numbers at the bottom of the tag. The number
of digits will vary depending on the engine application. All the numbers will
be required to process an engine request. If this is the original engine in
the vehicle, the engine information is available in GMVIS. Choose the Vehicle
Component selection, the 3 position alpha-numeric code is the Part/Num Broadcast
section and the Traceability section is the bar code information that is required.
It may be easier to use GMVIS to obtain the necessary information; however,
it is only valid for the original engine.
GMVIS Screen
Typical Engine Tag
6 Cylinder Engine Locations
| • | L36 and L67 applications -- Center of the LH rocker arm or
LH side of the engine in the oil pan rail area of the engine |
| • | LX5 applications -- Front end of the LH rocker cover |
| • | L35 and LU3 applications -- Front of the RH cylinder head
or right side of the oil pan sump |
| • | LA1 and LG8 applications -- Top of the RH rocker arm cover
or front of RH oil pan rail |
| • | L81 and LA3 applications -- On cam drive cover on the front
of the engine |
| • | LL8 applications -- Rear of rocker arm cover on the front
of oil pan rail on the RH side |
V8 Engine Locations
| • | LR4, LM7, LQ4 and LQ9 applications -- Rear of RH cylinder
head or RH side of the oil pan |
| • | LS1 and LS6 applications -- Rear of LH cylinder head or the
front part of LH oil pan rail |
| • | L30 and L31 applications -- Rear of RH rocker cover or on
the RH side of the oil pan |
| • | L46, L37 and LD8 applications -- Front of RH rocker cover
or the RH side of oil pan rail |
4 Cylinder Engine Locations
| • | L61 applications -- Front of the rocker cover |
| • | LN2 and L43 applications -- Top of the rocker arm cover |
| • | LD9 applications -- Top of the timing chain cover |
Goodwrench® and Remanufactured Engine ID Tags
The tag is made of metal and is approximately 2 in x 1-11/16 in
(5.1 cm x 4.3 cm). It is installed on all remanufactured engines
and new engines assembled by non-GM suppliers.
