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suffolk colt exhaust

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andytyler99 Mon, 14/05/2012

suffolk colt. exhaust stub.

im refurbishing a colt just for home use. the bolt on top of the stub which holds on the exhaust has sheared off. 

i could replace the stub but i can not remove it despite trying wd40, heat and lots of force.

any other suggestions on how to get the stub out or alternativly just way to attach a muffler to quiten it down and reduce fire risk.

im quite handy but dont own a welder.

Forums

hillsider Tue, 15/05/2012

Hello and welcome to the Old Lawnmower Club,

I afraid heat and a large pair of Stillsons is about the only thing that will move those when they are well rooted.

However if the end of exhaust stub is still there with the remains of the original stud you could file it flat and then drill and tap a thread in the end of the stub. You can either use a bolt or fit a replacement stud to secure the original silencer.

I have used this method with the oval/flat silencers and had a good result so good luck.

Ray.

andytyler99 Tue, 15/05/2012

thank you for the reply.

just been playing with the machine tonight, de-coking the head and possibly by luck i've finally got it to idle really well (if a little noisy without an exhaust)

your method of drilling an additional hole sounds good and i will have a go at that next time iv got a spare couple of hours. i had some high temp resin laying about and i tried that to hold the exhaust on last week, as you wont be suprised that didnt work!

cheers for the advice

andy

redfernmowers Sat, 19/05/2012

two solutions available here.

1: use a centre punch to tap a guide hole to the stub. now with a 5mm or so drill bit, drill into the stud. you will need a screw extractor system of a strong steel. I'd recommend facom or snap-on for this. the screw extractor runs in reverse to create a thread it then bites to. then at the same time should remove the thread. 

2: THIS IS RISKY WITHOUT EXPERIENCE: create an extra bit of metal to the stud by welding on to it with a stick or mig welder. please ensure that you have removed the fuel tank, carb, etc and drained the engine of fuel. I have done this a couple of times and it's helped a lot but it has it's risks as stated.

Either way, if you're not proficient in welding, use the reverse tap option.

here's a useful tip. while performing the first step. use 3-in-1 oil, a few drops worth, whilst creating the initial strike before drilling. then apply a bit of concentrated heat to the area concerned. this should help. WD40 with heat won't work as it disolves rapidly with heat as a solvent.

lew