Petro Chug-A-Pump

[factory 487]

This is the latest addition to my O&R collection, a Petro Powered Products Chug-A-Pump.

The engine is an early compact I with the side mounted carb needle & screws in the back of the starter/blower cover.

 

 

Unfortunately a previous owner disliked the starter mechanism so much that they cut it off completely.

 

 

The engine was also seized & the flywheel nut threads were stripped, fortunately the crankshaft threads are OK. After removing the sparkplug I discovered someone had tried and failed to unseize it by hammering the piston with a rod, the piston has a hole in it. I left it overnight with some oil poured in the cylinder.

 

Today I stripped it down further, I was surprized to find the flywheel key was steel, it does have a different part number to the later engines so may be original? The oil left in overnight did the job and I was able to turn the flywheel a bit, which enabled me to remove the cylinder without damaging the conrod. The cylinder is a bit rusty but hopefully it will clean up for reuse. The missing bits of the piston were shaken out of the crankcase.

 

 

The gudgeon pin is also different to the later engines as it is solid, it is also smaller in diameter, I have a few spare pistons but they can't be used because of this.

 

 

David

Edited December 20, 2014 by factory

[pmackellow 2,738]

Looks a nice project, obviously the previous owner favoured the "hit it to mend it" technique !!

[Webhead 95]

_{Or he was just a fan of the BFH!}

Edited December 21, 2014 by Webhead

[Wallfish 698]

Too bad someone hacked away on that engine.

Did you make that tool for removing the cylinder?

[factory 487]

Yes I made the tool for removing the cylinder, I have added a new thread about it here:

http://myoldmachine.com/topic/1499-cylinder-removal-tool/

 

As for the engine I have come to the conclusion that it cannot be repaired without the correct piston, as both the conrod & crankshaft/backshaft are completely different to those from a later engine. This is due to the redesign they did to change all the bearings. The later one is at the bottom of the picture.

 

David

 

[Wallfish 698]

Did you contact Joe about a piston? I can take a look and see if I have one too.

[factory 487]

I haven't yet as I keep forgetting to measure the gudgeon/wrist pin. It's also going to need a set of early type starter dogs as well as a complete replacement blower/starter cover.

 

David

[Ian 2,417]

It's a shame about the damage but it does have a great name.. Chug-a-pump

[Webhead 95]

I should have everything that you need.

[factory 487]

Finally got round to measuring the gudgeon/wrist pin, the size is 0.312"  I guess O&R used a standard  5/16" rod the make these. The later one measures 0.317".

The picture shows the damaged piston together with a later one.

 

David