Crankshaft Regrinders

The crankshaft is what pushes the con rods up and down. The pistons are attached to the top of the con rods which are attached at their big end to the crankshaft. The rotation movement of the crankshaft gives the up and down movement of the pistons. The tolerances in this area are to 5000 of an inch. ( 4 times less than a rizla paper) Any wear in this area of the engine can be catastrophic and should be repaired immediately. Crankshaft Regrinding is carried out in store and advice on what other components should be checked will be given.

Many crank shafts can be machined. The method used is to grind using a specialist crankshaft grind machine. Material is removed from the shaft in the grind process, oversize bearing would be required. Even badly damaged crankshafts can be repaired by welding. Connecting rods should always be serviced at the same time of a crankshaft regrind.

Guide to prices

Crankshaft repair - we inspect for crankshaft run-out(straightness), use Magnaflux and black light for finding hidden cracks, and to make judgments and recommendations for crankshaft rod journal turning, polishing, straightening, either way we are happy to advise you on the best options

Bearing Faults - Crank-shaft main and big end bearings are usually made from tin alloy or a lead copper material. Bearings may get damaged due to contamination on installation. Unmatched torqueing. The most often cause is that the engine oil level drops below its minimum level causing oil starvation. A lack of engine oil will always end up in a major engine failure. The crankshaft bearings will almost certainly be the first component to failed causing heavy engine knocking and will require a full engine rebuild in most cases.

Engine Knocking - It is possible that you have a failed bearing, but equally a bad piston pin can also make similar knocking sounds. Time for a checkup!

 

Bent Crankshaft - If they have an excessive bend they should be replaced. Our mechanicswill let you know if we encounter this during our initial inspection.

 Technical Specifications:

MODEL

H-24  

H-49

H-25  

H-26

H-27  

H-28  

H-48  

H-29

H-30

Size (in inches)  

40"  

48"  

60"  

72"  

84"  

90"  

104"  

120"

150"

Max. distance between centres (mm): 

1000  

1200  

1500  

1800  

2100  

2250  

2600  

3000

3750

Max. distance between chucks (mm):  

900  

1100  

1400  

1700  

2000  

2150  

2500  

2900

3600

Maximum weight of shaft (Kgs.):  

50  

60  

80  

100  

125  

150  

200  

300

700

Swing over table (mm):  

400  

400  

500  

500  

650  

650  

650  

660

965

Maximum stroke (mm):  

175  

175  

225  

225  

280  

280  

280  

280

400

Height of centres above table (mm):  

212.5  

212.5  

262.5  

262.5  

337.5  

337.5  

337.5  

342.5

508

Work Head Spindle Speeds (RPM):  

27-41-61  

27-41-61  

27-41-61  

27-41-61  

27-41-61  

27-41-61  

18-27-41  

18-27-41

18-27-41

Grinding wheel speed (RPM):  

1000  

950  

950  

950  

750  

750  

750  

700

650

Table traverse rapid / rev (mm):  

10  

10  

10  

10  

10  

10  

10  

10

10

Wheel head feed slow / rev. (mm):  

0.125  

0.125  

0.125  

0.125  

0.125  

0.125  

0.125  

0.125

0.125

Wheel head feed rapid / rev. (mm):  

6.25  

6.25  

6.25  

6.25  

6.25  

6.25  

6.25  

6.25

6.25

Grinding wheel dia. x width (mm):  

600 x 22  

650 x 25  

650 x 25  

650 x 25  

800 x 25  

800 x 25  

800 x 25  

800 x 25

915 x 38

Grinding wheel bore (mm):  

150  

200  

200  

200  

200  

200  

200  

200

305

Tail stock quill travel (mm):  

50  

75  

87.5  

87.5  

87.5  

87.5  

87.5  

75

--

Wheel head motor (HP):  

3  

3  

5  

5  

7.5  

7.5  

7.5  

7.5

10

Work head motor (HP):  

1  

1  

1  

1  

2  

2  

2  

2

2

Coolant pump motor (HP):  

0.1  

0.1  

0.1  

0.1  

0.1  

0.1  

0.1  

0.1

0.1

Coolant pump capacity (Liters / min.):  

18  

18  

18  

18  

18  

18  

18  

18

18

Total length of machine (mm):  

2550  

3000  

3400  

3700  

4300  

4500  

4900  

6000

7500

Total Width of machine (mm):  

1550  

1550  

1650  

1650  

1825  

1825  

1825  

1980

2000

Total height of machine (mm):  

1500  

1500  

1500  

1500  

1600  

1600  

1600  

1625

1980

Work space required (LxW) (mm):  

4000 x 2500

4500 x 2500

5400 x 2800

6000 x 2800

6500 x 3250

7150 x 3250

7500 x 3250

9150 x 3250

11250 x 3500

Approx. Net weight (kgs.):  

2700  

3000  

4000  

4200  

5000  

5100  

5500  

7000

8500

Approx. Gross weight (kgs.):  

3500  

3800  

5000  

5200  

6300  

6500  

7000  

8500

11000

Shipping dimensions (L x W x H) (mm):  

2750 x 
1650 x 
1600

3200 x 
1650 x 
1600

3550 x 
1800 x 
1750

3750 x 
1800 x
1750

4450 x 
2025 x 
1850

4450 x 
2025 x 
1850

4750 x
2025 x
1850

5900 x
2100 x
1900

7700 x
2200 x
2200

Approximate shipping volume (m3):

7.50  

8.50  

11.00  

12.00  

16.50  

16.65  

17.50  

23.55

36.30

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