Fairlady - More work done on the motor.

I got some more work done on the L20a. I cleaned up the block then I used a strait edge and feeler gauges to make sure deck and head are still flat. Other than the piston damage this should be a simple rebuild. The bores are still within spec, but I am planning to have the block bored over just to be safe. Once I source some replacement pistons the block will be ready for a trip to the machine shop to be bored and honed.

Parts from the motor.

Started tearing the head down.

 Rockers removed.

 

Bare head.

After a little cleanup.

Fairlady - L20a motor pulled from the Fairlady.

Pulled the motor out this weekend and took everything apart. The head has been taken off before since it had felpro gaskets but the bottom end still had the original nissan gaskets and looks like it hasn't been touched.

I still need to clean everything up for closer inspection and measurements but piston #1 will definitely need to be replaced.

L20a on the stand.

Valve cover off - so far everything looks good.

Head removed.

 

Now I can see that piston #1 has some damage.

  

I checked the head and it has the same indention on #1. It does not look like the valves are damaged.

 

Front cover, water pump, alternator removed.

 

Oil pan removed.

Crankshaft and connecting rods ready for removal.

Bare block.

All Done.

Now for the damage - Piston #1 is completely wrecked. The sideskirt and top of the piston are cracked. The second compression ring is wedged tight into the ring land.The top of the piston and the head both have the same indention.The connecting rod is also very stiff. I still need to gauge the block to find out if it will need to be bored. If a foreign object made it into the cylinder I would think there would have been more damage to the head.

 

The two rounded indentions are valve relief cuts. The notch on the right is also supposed to be there. Everything else should be smooth.