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How to Set Perkins Engines Bridge Pieces and Valve Clearance

Oct. 18, 2019

Perkins Engines Closed Circuit Breather System

The closed circuit breather separator is mounted on the right hand side of the gearcase and is connected to the air inlet system between the air cleaner and turbocharger via the breather valve (see Fig.38).

Perkins closed circuit breather system.jpg


It consists of a filter separator (1) and two breather valves (2) with a pipe feeding into the air inlet system (between the air cleaner and turbocharger).

To clean the breather valves release the pipe clips (A) and pull away the breather valves and the valve manifold from the engine. Release the clamp (3) see Fig.39 and remove the breather valves from the valve manifold. Wash the breathers thoroughly in a suitable solvent paying particular attention to any deposits on the internal area of the breather. Shake as dry as possible and blow dry compressed air.


release the clamp.jpg


Before refitting ensure that the cup at the base of the two breather valves are full of clean engine oil and the 'O' ring at the base of the breather valve is in tact.

Release the retaining clips and remove the top. cover (1) see Fig.40 from the filter separator body (2) remove the foam element (3) and the gauze strainer (4) check it for oil sludge saturation wash thoroughly in a suitable solvent, shake off excess solvent and blow dry with compressed air. Clean any oil sludge deposits from the filter body re assemble and fit to engine.

NOTE: Cleaning agents must not enter the engine via the breather system as oil dilution may occur causing engine damage.


remove the top cover.jpg



Equalizing Rocker Bridges and Setting Valve Clearances


NOTE: The bridge pieces must be set before attempting to set the valve clearances. 

Remove the 4 screws (l) from each rocker cover (2), lift off the covers and peel off and throw away the old gaskets Fig.41.


lift off the covers.jpg


To equalize the bridge pieces the appropriate valves must be rocking. In order that the engine may be rotated while the batteries are disconnected a special cranking device (SE253) can be fitted to a starter motor hole in the flywheel housing see Fig. 42. 


starter motor hole.jpg


The flywheel housing has an inspection hole directly below the turbocharger through which the flywheel markings may be seen to line up with the pointer set in the flywheel housing Fig.43.


flywheel housing.jpg


Using a socket and ratchet wrench press against the spring loaded bolt head until the pinion engages with the flywheel gear then crank the engine to the desired position.

 

Equalizing the Bridge Pieces

Having rotated the engine to the correct position, check that the inlet and exhaust rockers have clearance before continuing with the next operation. Loosen the lock nut (1) on each bridge piece, screw the adjuster (2) out until the fixed side of the bridge piece rests on its valve, hold the top edge down with one hand, then screw the adjuster down until you feel it touch the valve, thereby equalizing valve lift. Tighten the lock nut without moving the adjusters (see Fig.44).


tighten the lock nut.jpg

 

Setting Valve Clearance

With both bridge pieces equalized check the valve clearance of 0.4 mm (0.016") inlet and exhaust using a feeler gauge (1). If adjustment is required loosen the lock nut (2) and using the adjuster screw (3) set the clearance (see Fig.45). Tighten the lock nut without moving the adjuster. The feeler gauge should be a slide fit between the rocker and bridge piece thereby giving the correct clearance. Refit the rocker cover with a new gasket.


set the clearance.jpg

 


Engine 4006

T.D.C

Valves Rocking on Cylinder No.

Set Bridge Piece and Valve Clearance on Cylinder No.

1   and 6

6

1

2   and 5

2

5

3   and 4

4

3

1   and 6

1

6

2   and 5

5

2

3   and 4

3

4

Engine 4008

T.D.C

Valves Rocking on Cylinder No.

Set Bridge Piece and Valve Clearance on Cylinder No.

1   and 8

8

1

4   and 5

5

4

2   and 7

2

7

3   and 6

3

6

1   and 8

1

8

4   and 5

4

5

2   and 7

7

2

3   and 6

6

3

 

Schedule for Engines in Stand-by Duty

For engines which are in use for a total of fess than 400 hours in every twelve months, the schedule below must be used:

The preventive maintenance operations must be applied at the interval (hours or months) which occurs first.

A-Monthly

B-3 Months

C-Every 200  hours or 6 months

D-Every 1,000 hours or 12 months

A

B

C

D

Operation

·




Check the amount of coolant.

·




Check the lubricating oil level.

·




Check the restriction indicators for the air filters and, when necessary, renew 

the filter elements.


·



Start and run the engine on load until 

normal temperature of operation is 

reached.

·




Drain the water/sediment from the 

primary fuel filter.




·

Check the condition and the tension of all drive belts.




·

Check the specific gravity and pH valve of the coolant.



·


Renew the lubricating oil and filter.





Check radiator air restriction (visual).



·


Clean centrifugal oil filter.



·


Renew the canister of the main fuel 

filter.




·

Ensure that the fuel injectors are checked and corrected or renewed, if necessary*




·

Equalize bridge pieces and check valve clearances.

 

NOTE: All bolts, hose clips, terminal connections, pipes and joints must be checked for tightness and leaks every 3 months unless stated otherwise.

* By a person who has had the correct training.


Schedule for Engines in Continuous Duty

A-Daily

B-Every 250 hours or 6 months

C-Every 2500  hours or 12 months

A

B

C

Operation

·



Check the coolant level.

·



Check the lubricating oil level.

·



Check the restriction indicators for the air filters and, when necessary, renew the   filter elements.

·

·


Drain the water/sediment from the primary fuel filter.


·


Check the condition and the tension of all drive belts.


·


Check the specific gravity and pH valve of the coolant.


·


Renew the lubricating oil and filter.


·


Visually check for radiator air restriction.


·


Clean centrifugal oil filter.


·


Renew the canister of the main fuel filter.


·


Clean the water trap sedimenter.


·


Equalize bridge pieces and check valve clearance.


·


Check that the air charge cooler and the radiator are clean and free from debris.



·

Drain and flush the coolant system and renewe coolant mixture.



·

Ensure that the fuel injectors are checked and corrected or renewed, if necessary*


As Perkins genset OEM, our Starlight diesel generating sets apply diesel engines from Perkins Engines Co.,Ltd, equipped with brushless self-excited AVR. We can provide 25KVA to 2250KVA Perkins diesel generator with good quality and performance.

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