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Readers ask: How is camshaft bearing clearance measured?

For these reasons, bearing clearances are specified as “vertical clearance” and must be measured at 90 degrees to the split line. The best method of measurement is with a dial bore gage that measures the bearing inside iameter when the bearings are installed at the specified torque without the shaft in place.

How is bearing clearance determined?

This is the total clearance inside a bearing in the radial direction. Its numerical value can be calculated by subtracting from the diameter of the outer race roller path or ball groove I.D. two times the rolling element diameter and the O.D. size of the inner race roller path or ball groove.

What is cam bearing clearance?

Typical oil clearance of camshaft bearings is 0.0015-0.002” *D Where D – the bearing diameter.

What is used to measure bearing clearance?

A plastic gauge is a thin calibrated plastic strip. It can be used to check bearing clearance and also gap dimensions. It is used at points on connecting rod or crank bearings where a quick measurement with a micrometer is not possible.

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What measuring tool is used to measure the camshaft bearing journal?


  • A vernier dial caliper is used to measure the outside diameter or length of a component such as a piston diameter or crankshaft and camshaft bearing journal diameter.

    How much clearance do you need between bearing and shaft?

    For most applications. 00075 to. 0010” (three quarters to one thousandth of an inch) of clearance per inch of shaft diameter is a reasonable starting point.

    How much bearing clearance is too much?

    It’s less of a concern in a dedicated racing engine, but for an engine that’s driven daily, it can increase wear and make it easier to spin a bearing, which will totally ruin your day. As a rule of thumb, main bearing clearance should be targeted between 0.0025- and 0.0020-inch for most street and street/strip engines.

    Can you replace cam bearings without removing crank?

    Not possible, or desirable. The engine needs to be completely disassembled and the proper tools used. After cleaning and expansion plug installation, cam bearing installation is the next step when rebuilding the engine.

    What is C1 C2 C3 in bearing?

    C1 offers the least extra clearance, C5 offers the most extra clearance. The extra margin C3 offer is considered ‘normal’. Bearings with C3 are in fact the most commonly used. The radial play grades for non-assembled bearings are defined in ISO standards: C2 – Less clearance than normal.

    How accurate is Plastigage?

    Tech Tip: Be sure to always use the inch side of the Plastigage package. Most good micrometers will measure down to 0.0001 inch (one ten-thousandths of an inch), which is plenty accurate.

    How do you check the axial clearance of a bearing?

    The axial clearance is the measured value in which one bearing ring can move axially in relation to the other. In bearings of the same type, axial clearance depends on the radial clearance. The contact angle is formed between the connecting line of the contact points ball/raceways and a plane perpendicular to the axis.

    What tool is used to measure clearances?

    A feeler gauge is a tool used to measure gap widths. Feeler gauges are mostly used in engineering to measure the clearance between two parts.

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