# Short-Questions

Fast solutions for complex problems

30

## How are crank journals measured?

The dial bore gauge measures the inside of round holes, such as the bearing journals. This one tool can measure 2″ up to 6″ diameter holes. Both tools are needed in order to check the interior and exterior dimensions of the crankshaft, rods and engine block journals, as well as the thickness of the bearings themselves.

### What is the crankshaft journal diameter?

55mm
A standard Volkswagen crankshaft main journal size is 55mm this also can be measured as 2.165in depending on your location.

#### How do you measure crankshaft size?

When measuring the bearing this would be the bearing inner diameter (or i.d.). When measuring the crankshaft this is would be the journal outer diameter (or o.d.). (Example: You measure the bearing inner diameter and it measures 54.75mm/2.155″ this indicates your crank has been machined .

How do I know what size connect rod to get?

A Connecting Rod is measured between the centers of the crankshaft journal bore and the piston pin bore. It can be listed in inches or millimeters. The connecting rod’s length will impact Rod Ratio . Also, changing the rod length will require new pistons with the correct Compression Height .

Which instrument is used to check the run out of crankshaft journal?

dial indicator
A dial indicator and magnetic stand can be used to check the ‘run out’ of each main journal. Pinto engines have central thrusts and these should be in place (unoiled) when the crankshaft is turned to prevent possible damage to the crankshaft thrust surfaces through block contact.

## What are crank journals?

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.

### Does my crankshaft need grinding?

Upon initial inspection of the crankshaft, with the use of the micrometer, the machinist will determine what bearings need grinding. Indicators that a journal needs grinding include if the surface has wear and make it rough to the touch.

#### How do I know if my crankshaft is worn out?

Symptoms of a Bad Crankshaft Position Sensor

2. It’s Difficult to Get Your Vehicle to Start.
3. Your Vehicle is Stalling and/or Backfiring.
4. The Engine is Making Your Vehicle Vibrate.

How do I know my main bearing size?

The commonly accepted rule that most crankshaft manufacturers prefer for street and performance engines is 0.0010-inch for every 1-inch of journal diameter. So for a 2.45-inch small-block main journal, the bearing clearance would be 0.0024-inch.

Which length is the crank throw?

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. The throw is equal to one-half the stroke. The longer the throw, the greater the stroke, or distance, a piston travels.

## What is stronger H-beam or I beam connecting rods?

I-Beams can be just as strong as H-Beams, but H-Beams can often handle higher compressive loads than I-Beams with less overall weight. Consequently, H-Beam connecting rods are often recommended for high torque motors that produce a lot of power at low rpm (under 6,000 rpm).

### Are 5.3 and 6.0 cranks the same?

due to stroke differences and each had different casting numbers. The 6.0L crank has the same stroke (92mm) as the 5.3L and 5.7L cranks.

#### How big is the journal size on a crankshaft?

Your crankshaft may have been cut down in size previously by a machine shop. Make sure your crank will work in the block you have. Blocks were made for each crank main journal size.

What do you need to put a crank in a journal?

Make sure your crank will work in the block you have. Blocks were made for each crank main journal size. If you are putting a “small” or “medium” journal smallblock crank into a “medium” or “large” journal smallblock block you will need crank bearing “spacers” or use special “thick” bearings available from aftermarket suppliers.

Where are the bearings on a crankshaft located?

With the correct oil pressure and supply of oil, the journal and the bearing should not make contact. The connecting rod journals are offset from the axis of rotation, and are attached to the big ends of the pistons’ connecting rods. Confusingly, they are commonly also called crank pins or rod bearing journals .

## Is the crankshaft a reliable part of the engine?

This necessitates the rod journals being split, or splayed, in what is known as a split-pin or split-journal design. The crankshaft, being very sturdy, is a reliable component and crankshaft failures are rare unless an engine is subject to extreme conditions.