Jeep Wagoneer/Commando/Cherokee 1957-1983 Repair Information

Engine

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4-134 ENGINE



The engine serial number for the Willys built F-Head 4 cylinder engine is located on the water pump boss at the front of the engine. It consists of a 5 or 6 digit number. The engine code prefix for the F-Head is 4J.

It is sometimes necessary to machine oversize or undersize clearances for cylinder blocks and crankshafts. If your engine is equipped with oversized or undersized parts, it is necessary to order parts that will match the old parts. To find out if your engine is one with odd-sized parts, check the engine code letter or the engine code number itself which in some cases is followed by a letter or a series of letters. The following chart explains just what the letters indicate:



Letter A (10001-A) indicates 0.010 in. undersized main and connecting rod bearings.
 
Letter B (10001-B) indicates 0.010 in. oversized cylinder bore.
 
Letter AB (10001-AB) indicates the combination of A and B above.
 
Letter C (10001-C) indicates 0.002 in. undersized piston pin.
 
Letter D (10001-D) indicates 0.010 in. undersized main bearing journals.
 
Letter E (10001-E) indicates 0.010 in. undersized connecting rod bearing journals.
 

6-225 ENGINE



The engine number for the Buick built V6-225 engine is located on the right side of the engine, on the crankcase, just below the head. The code is KLH. The codes RU and RV, included in the engine number of 1965 and 1966 engines, indicate manual or automatic transmission, respectively.

It is sometimes necessary to machine oversize or undersize clearances for cylinder blocks and crankshafts. If your engine is equipped with oversized or undersized parts, it is necessary to order parts that will match the old parts. To find out if your engine is one with odd-sized parts, check the engine code letter or the engine code number itself which in some cases is followed by a letter or a series of letters. The following chart explains just what the letters indicate:

Letter A (10001-A) indicates 0.010 in. undersized main and connecting rod bearings.

Letter B (10001-B) indicates 0.010 in. oversized cylinder bore.

Letter AB (10001-AB) indicates the combination of A and B above.

Letter C (10001-C) indicates 0.002 in. undersized piston pin.

Letter D (10001-D) indicates 0.010 in. undersized main bearing journals.

Letter E (10001-E) indicates 0.010 in. undersized connecting rod bearing journals.

6-226 ENGINE



The 6-226 engine serial number is stamped on a machined surface near the left front corner of the block, above the generator. The serial number will have a prefix, FW, followed by a 5 digit number.

6-230 ENGINE



The 6-230 engine serial number is stamped on a machined surface on the right front of the block, just behind the ignition coil. The serial number prefixes are:

NS60C: 2-wheel drive, manual trans., 1-bbl carburetor

TS60C: 4-wheel drive, manual trans., 1-bbl carburetor

ND60C: 2-wheel drive, manual trans., 2-bbl carburetor

TD60C: 4-wheel drive, manual trans., 2-bbl carburetor

AD60C: Automatic Transmission

A suffix A, indicates 0.010 in. oversized main and rod bearings; B indicates 0.010 in. oversized pistons; AB is a combination of both.

6-232 ENGINE



The American Motors engine code is, of course, found in the identification plate on the firewall. The second location is on a machined surface of the block between number 2 and 3 spark plugs. For further identification, the displacement is cast into the side of the block. The letter in the code identifies the engine by displacement (cu in.), carburetor type and compression ratio.

On vehicles equipped with the 6-232 made prior to 1971, the engine code number is located on a machined surface, adjacent to the distributor. The letter contained in the code number denotes the cu in. displacement of the engine. The letter, L, denotes 232 cu in. 8.5:1 compression ratio. The engine code letter is located on a boss directly above the oil filter.

On 6-232 engines built before 1971, the size code is stamped on a tag located on the left front side of the baffle above the intake manifold below the build date, and on the boss above the oil filter. The following chart explains just what the letters indicate on the 232 sixes made prior to 1971:

First Digit Size of the bore: A, B, or C

Second Digit Size of the main bearings: A, B, or C

Third Digit Size of the connecting rod bearings: A, B, or C

A-Standard; B-0.010 in. Undersized; C-0.010 in. Oversized

All of the engines made after 1971 have the same undersize/oversize letter codes, located on the boss directly above the oil filter. The parts size code is as follows:

Letter B indicates 0.010 in. oversized cylinder bore.

Letter M indicates 0.010 in. undersized main bearings.

Letter P indicates 0.010 in. undersized connecting rod bearings.

Letter C indicates 0.010 in. oversized camshaft block bores.

8-304, 360, 401 ENGINES



On the American Motors built 304, 360 and 401 V8 engines, the number is located on a tag attached to the right valve cover. For further identification, the displacement is cast into the side of the block. The letter in the code identifies the engine by displacement (cu in.), carburetor type and compression ratio.

All of the engines made after 1971 have the same undersize/oversize letter codes, located on a tag next to the engine number. The parts size code is as follows:

Letter B indicates 0.010 in. oversized cylinder bore.

Letter M indicates 0.010 in. undersized main bearings.

Letter P indicates 0.010 in. undersized connecting rod bearings.

Letters PM indicate a combination of the above specifications for P and M.

Letter C indicates 0.010 in. oversized camshaft block bores.

8-327

On the Willys built 8-327, the engine code number is located on a tag which is attached to the alternator mounting bracket. The top line of the tag contains the letters KJC (Kaiser Jeep Corporation) and two letters which will identify the type of transmission and clutch used. The bottom line of the tag has a six digit number, in which the first digit indicates the year that the engine was built; 7-1965; 8-1966; 9-1967; 1-1968. The second and third digit is the month in which the engine was made. The fourth digit indicates the compression ratio: E-8.7:1; F-9.7:1. The fifth and sixth digits indicate the day of the month in which the engine was constructed. The lower half of the tag designates the specific engine group. The engine code letter is stamped directly under the date line on the tag and also on the front face, left bank, on the cylinder block.

On the 327 V8, the size code letters are stamped below the build date on the plate on the alternator bracket.

First Digit Size of the bore: A, B, or C

Second Digit Size of the main bearings: A, B, or C

Third Digit Size of the connecting rod bearings: A, B, or C

A-Standard; B-0.010 in. Undersized; C-0.010 in. Oversized

8-350 ENGINE



The engine code number on the Buick built 8-350 is located on the left-hand side (looking from the rear) of the cylinder block deck, between the front two spark plugs. The first letter K indicates that the engine was built for the Kaiser Jeep Corporation. The second letter in the engine code number indicates the year in which the engine was built: P-1968; R-1969; S-1970; T-1971. The third digit indicates the compression ratio, and the fourth and fifth digits indicate the day of the year plus any change. The Buick 350 V8 has no engine letter code.

 
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