Stripping 16 Valve Engine

16 Valve Engine

The above pic is of an chain driven engine. Where we were working on belt driven.

We were supplied engines from Unitec Albany & ask to pull them apart & study what each part of the engine does.

Intake Valve's - The diameter is slightly bigger than the Exhaust Valve & burns clean.

Exhaust Valve's - Diameter is smaller & will burn a lot dirtier than the Intake Valve's. If you are not sure which on is which when pulling them apart - Wipe your finger around the Intake ports & the Exhaust ports, The Exhaust ports will be dirty & leave black marks on your finger. Where as the Intake ports are cleaner.

Intake:

Air + Fuel - Piston, Bottom Dead Center

Inlet valve - Open

Exhaust valve - Closed

Compression:

Inlet valve - Closed

Exhaust valve - Open

Piston, Top Dead Center

Power:

Piston, Top Dead Center

5 Degree - 9 Degree Spark

Inlet valve - Closed

Exhaust valve - Closed

 Exhaust:

 Exhaust valve - Open

Inlet valve - Closed

Piston, Top Dead Center

Stripping The Engine

• Timing belt covers have been removed.

• Removing a pulley.

•  Rocket cover has been removed.

• What your looking at s the inside of cylinder head, top of the rockers.

• Camshaft pulley at the top, which the timing belt attaches to.

• Water pump attaches in the middle.

• Next is the tensioner, Followed by the crankshaft.

•  The crankshaft pulley

• This is how the timing is done, The belt attaches to the camshaft pulley & crankshaft pulley.

• Using the grove & the arrow facing done to the grove.

• Also by attaching a ratchet to the crankshaft bolt

• To do the timing

• To take the belt off, the tensioner needs to be loosened & pushed slightly to the right.

• Once this done then the belt will slide off nice & easy

• The belt been removed

• Removal of the rocker shaft bolts

• When removing these, they need to undone from the inside out in a circular motion. The same when you are tightening them.

  

• Bolts & rocker shafts being/ been removed

• Cylinder head bolts

• When loosening these bolts there is a specific order they need to be undone.

• The bolt that is being removed in this pic is number 9 bolt, second to last bolt to be removed.

• This video shows how the cylinder head removes once the bolts have been taken out.
• Also take in to count that there is still parts that need to be removed for the head to come right off.

• The distributor 
• There is two bolts that hold this on.

• The other end of the distributor that connects to the camshaft

• End of camshaft where the distributor connects

• Solid metal clip that helps hold the camshaft in place.
• Before removing the camshaft this little clip will need to be removed & also the camshaft might need to be knocked out using a rubber hammer due to a rubber seal on the other end tightly holding this in.

• After the camshaft is free to slide out, we then needed to to put a adjustable crescent on the end of the camshaft the is shaped like a bolt end. ( pic above)
• And using the ratchet to undo the pulley bolt.

• Removing the camshaft

•  Removing the spark plugs by using a ratchet, using the right sized spark plug adaptor to fit the end of the ratchet.

• Spark plugs removed

• The video on the right is showing how to remove the valves safely with out damaging anything.