Camshaft Journal Wear

Check camshaft journals and camshaft housing for pitting, scratches, wear or damage.

If any malcondition is found, replace camshaft or cylinder head with housing.

Never replace cylinder head without replacing housings.

Fig 1: Identifying Camshaft Housing

Courtesy of SUZUKI OF AMERICA CORP.

Check clearance by using gaging plastic. The procedure is as follows.

1. Clean housing and camshaft journals.
2. Make sure that all valve lash adjusters are removed and install camshaft to cylinder head.
3. Place a piece of gaging plastic the full width of journal of camshaft (parallel to camshaft).
4. Install camshaft housing.
5. Tighten camshaft housing bolts in such order as indicated in the figure a little at a time till they are tightened to specified torque.
   NOTE: Do not rotate camshaft while gaging plastic is installed.

   Tightening torque 

   1. Camshaft housing bolt (a):  11 N.m (1.1 kg-m, 8.0 lb-ft)
   Fig 2: Identifying Camshaft Housing Bolts Tightening Sequence

   Courtesy of SUZUKI OF AMERICA CORP.
6. Remove housing, and using scale (2) on gaging plastic (1) envelop, measure gaging plastic (1) width at its widest point.

   Camshaft journal clearance 

   1. Standard:  0.045 - 0.099 mm (0.0018 - 0.0039 in.)
   2. Limit:  0.12 mm (0.0047 in.)
   Fig 3: Measuring Camshaft Journal Clearance

   Courtesy of SUZUKI OF AMERICA CORP.

   If measured camshaft journal clearance exceeds limit, measure journal (housing) bore and outside diameter of camshaft journal. Replace camshaft or cylinder head assembly whichever the difference from specification is greater.

   Camshaft journal bore diameter (IN and EX) 

1. Standard:  26.000 - 26.033 mm (1.0236 - 1.0249 in.)

Camshaft journal O.D. (IN and EX) 

1. Standard:  25.934 - 25.955 mm (1.0210 - 1.0218 in.)

Fig 4: Measuring Camshaft Journals & Bores

Courtesy of SUZUKI OF AMERICA CORP.