Yet another Laser, a 62!

This time with stripped threads in the crank-case.

Drilling out for HelicoilSo here we are drilling out the damaged thread in the lathe using the lathe milling vice and clamp to maintain total accuracy.

Tapping for HelicoilAfter drilling out the old thread, tap the hole using the tap in the 4BA Helicoil kit.

Helicoil in applicator toolThe 4BA Helicoil is tiny.

Inserting the HelicoilThen screw in the Helicoil insert using the tool supplied.

It Works!It works!

The engine is cleaned out and back together ready for it’s test run.

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Laser 90 running after rebuild.

 

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Laser 90 Together Again.

Here is the Laser 90 ready for testing.

Ready to test.

Ready to test.

Before and after timing case.

After

After

Before

Before

 

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Laser 90. Reassembly.

Starting to look more like an engine again.

Cam driver fitted.

Cam driver fitted.

Cylinder assembled to crankcase.

Cylinder assembled to crankcase.

There is some play in the “big end” but I am not, at this moment, set up to replace the bush in the con-rod.  I am just being picky here, the engine should have a new lease on life with the new bearings and piston rings.

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Laser 90 Piston Rings.

One of the piston rings in the bore to check for fit.

Piston ring inside the cylinder to check for fit.

Piston ring inside the cylinder to check for fit.

The ends of the ring must have a gap, seen to the left side of the picture, to allow for expansion when hot.  I think .005″ will be OK.

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Laser 90, Replacing Bearings.

Pressing the bearings back in to the crank case and crankshaft housing.

 

Cam driver bearing.

Cam driver bearing.

 

Main Crank Bearing.

Main Crank Bearing.

Nose bearing.

Nose bearing.

Crank assembly ready to fit.

Crank assembly ready to fit.

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Laser 90 Un-bearingable?

Bearings came out fairly easily using a car wiper arm removal puller.

Three bearings.

Three bearings.

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