Camshaft Bearing Journal Diameter
WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
-
NOTE: This engine utilizes hydraulic valve tappets with roller followers. Therefore, a roller follower guide is needed to maintain correct roller-to-cam lobe orientation. Normal clearance between the valve tappet and guide allows for slight tracking of the roller across the cam lobe. This tracking of the valve tappet roller is a normal characteristic as the roller accelerates and decelerates during typical engine operation. Consequently, a typical wear pattern on the cam lobes will exhibit tracks from side to side and have wide and narrow areas from the loading and unloading of the follower. The visual wear pattern (tracking) is normal and does not require installation of a new camshaft.
Inspect the camshaft. If any lobes are scuffed, scored or cracked, install a new camshaft.
-
NOTE: Typical camshaft shown.NOTE: When measuring the camshaft with a micrometer, always take 2 measurements 90 degrees apart.
Beyond visual inspection, evaluate camshaft main journal diameter as follows:
- Use a 50-75 mm (2-3 in) micrometer to measure camshaft bearing journal diameter. Record these measurements for later use in camshaft bushing inspection. If bearing journals are worn beyond limits, install a new camshaft. For additional information, refer to SPECIFICATIONS .