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V8 lubrication V8 cylinerheads Rockershafts Valves Pistons Flywheel V8 timing V8 Oilpump V8 Camshafts V8 Crankshaft All about the Rover SD1 EFI system
 

All engines

In all Rover V8 engines, oil is drawn from the pressed steel sump through a strainer and into the oil pump, excess pressure being relieved by the pressure relief valve. The on the cover screwed oil pressure warning switch registers the oil pressure in the main oil gallery on the outflow of the filter. If an oil cooler is fitted, pressurised oil passes through, and to the internal drillings in the cranksahft where it is directed to each main bearing and to the big end bearings via Nos. 1, 3, and 5 main bearings. An internal drilling in the cylinder block directs oil to the camshaft where it passes through further internal drillings to the hydraulic tappets, camshaft journals and rocker shaft. Lubrication to the thrust side of the cylinders is by oil grooves machined in each connecting rod big end joint face, which are timed to align with holes in the big end journals on the power and exhaust strokes.

The distributor drive and timing chain are lubricated from the camshaft front bearing. The feed to the timing chain is channelled along the cam-shaft sprocket, key and spacer.

The purpose of the hydraulic tappet is to provide maintenance free and quiet operation of the inlet and exhaust valves. It achieves this by utilising engine oil pressure to eliminate the mechanical clearance between the rockers and the valve stems.
During normal operation, engine oil pressure present in the upper chamber passes through the non-return ball valve and into the lower, high pressure, chamber. When the cam begins to lift the outer sleeve, the resistance of the valve spring felt through the push rod and seat causes the tappet inner sleeve to move downwards inside the outer sleeve. This downward movement of the inner sleeve closes the ball valve and increases the pressure in the lower, high pressure chamber, sufficiently to ensure that the push rod opens the valve fully. As the tappet moves off the peak of the cam the ball valve opens to equalise the pressure in both chambers which ensures the valve closes when the tappet is on the back of the cam.

Distributor drive and timing chain lubrication

 

  

 

 

Engine numbers without suffix B

This series V8 engines have there lubrication flow system from an external pump driven by the distributor shaft. Oil pump gears are housed in the timing cover and the pressure relief valve and warning light switch are fitted to the pump cover.

 

1. Oil strainer
2. Crankshaft main bearing oil feed
3. Oil pressure relief valve
4. Oil pump

5. Main gallery
A Oil to cooler
B Oil from cooler

 

Engine numbers with suffix B

This series V8 engine uses the cranksahft pump driven oil pump which is an integral unit with the timing cover and also carries the full flow oil filter, oil pressure switch and pressure relief valve.

1. Oil strainer
2. Oil pump
3. Pressure relief valve
4. Oil pressure switch

5. Main gallery
A Oil to cooler
B Oil from cooler

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1. Bearing
2. Camshaft
3. Key
4. Camshaft timing chain sprocket
5. Spacer
6. Distributor drive gear

The distributor drive and timing chain are lubricated from the camshaft front bearing. The feed to the timing chain is channelled along the camshaft sprocket, key and spacer.

 

1. Clip
2. Pushrod seat
3. Inner sleeve
4. Upper chamber
5. Non-return ball valve
6. Spring
7. Outer sleeve
8. Lower chamber - high pressure


The purpose of the hydraulic tappet is to provide maintenance free and quiet operation of the inlet and exhaust valves. It achieves this by utilising engine oil pressure to eliminate the mechanical clearance between the rockers and the valve stems.
During normal operation, engine oil pressure present in the upper chamber passes through the non-return ball valve and into the lower, high pressure, chamber.

When the cam begins to lift the outer sleeve, the resistance of the valve spring felt through the push rod and seat causes the tappet inner sleeve to move downwards inside the outer sleeve. This downward movement of the inner sleeve closes the ball valve
and increases the pressure in the lower, high pressure chamber, sufficiently to ensure that the push rod opens the valve fully.

As the tappet moves off the peak of the cam the ball valve opens to equalise the pressure in both chambers which ensures the valve closes when the tappet is on the back of the cam.

 

  

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