How is camshaft journal diameter measured?
1: Use a micrometer to measure camshaft journal diameter at the outer edge of each cam (as indicated by the numbers 1 and 2). Also take measurements 90 degrees apart to determine elliptical wear (as indicated by letters A and B)
Does cam journal wear increase oil pressure?
Worn crankshaft, camshaft, and rod bearings cause a lower oil pressure. There are different specifications and tolerances according to the application. This tolerance is usually no more than . 001 inch off the diameter of the bearing.
What causes camshaft journal?
Excessive wear of camshaft bearings may also be caused by oil starvation conditions at cold start of the engine. The oil path to the camshaft bearings is long in some engines. Therefore it takes some time for cold oil to reach the bearing surface.
What is camshaft journal diameter?
Inspect the camshaft journals. Using a micrometer, measure the journal diameter. 35.971 to 35.985 mm (1.4162 to 1.4167 in.) 22.959 to 22.975 mm (0.9039 to 0.9045 in.)…for Preparation Click here.
| Camshaft | Cam lobe height |
|---|---|
| Exhaust | 44.580 to 44.680 mm (1.7551 to 1.7591 in.) |
Can rod bearings cause low oil pressure?
Typically worn rod bearings, not main bearings or cam bearings, result in low oil pressure at idle. If the other bearings are worn, the pressure would be low no matter what the engine speed.
Will a spun rod bearing cause low oil pressure?
Spun bearings are often blamed on a loss of oil pressure, but there can be numerous contributing factors that eventually cause the bearing to seize and spin.
Can camshaft journals be repaired?
In most cases it can be repaired. This cam journal has a good amount of damage.
What makes a cam go flat?
Flat tappet cams are susceptible to damage due to a lack of zinc in modern engine oil, causing drivability problems as the lobe wears down. Here’s how to diagnose it. Flat tappet cams can be damaged by using modern engine oils that lack zinc and associated anti-scuff additives.
What is a crankshaft journal?
A crankpin journal is a precision ground surface that provides a rotating pivot point to attach the connecting rod to the crankshaft. The throw is the measurement from the center of the crankshaft to the center of the crankpin journal, which is used to determine the stroke of an engine.
What is a good journal size?
A5. A5 is the most common size used for journaling. Most brands offer this size.
What is an A5 journal?
A5-sized notebook (5-3/4” wide x 8-1/4” high) is perfect for journaling on the go. Notebook is large enough to write in comfortably, but small enough to fit inside a messenger bag or backpack.
How often should you change rod bearings?
The original rod bearings should be replaced every 60-80,000 miles, especially on vehicles which followed BMW’s 15,000-mile oil change recommendation.