Stihl 036 pressure test

[Fordsoll]

I Put the crankcase seals in my stihl 036 today after putting in the new bearings and before I reassembled it I wanted to pressure and vacuum test it but when I connected the pressure tester to the impulse line barb on the crankcase and squeezed the hand pump the pressure didn't move at all and the vacuum didn't either. I sprayed soapy water on the seals and cylinder base and no bubbles came out same with the crankcase gasket. My question is, is there something im missing? I used an intake boot with a spark plug on the end of it to seal the intake and for the exhaust I just made a gasket without a hole for the exhaust and I am using the impulse barb from the crankcase to pressure test it.

 

[Mad Professor]

Did you check you sealing of the intake/ex? Decomp shut?

 

[Fordsoll]

I have a decomp plug in it, I also sprayed soapy water around the intake and it didn't bubble but I didn't check the exhaust because it's a tight space but I will spray some soapy water there too just to see if I can see any bubbles.

 

[cookies]

check your crank seals and pump lines

 

[bigbadbob]

Dunk the entire saw in a pail of water ,, do this under pressure.

 

[Fordsoll]

I was hoping not to have to dunk the saw in a pail of water but thankfully the intake and exhaust was leaking so I fixed the intake with a bigger bolt but for the exhaust I tried tire tube and then exhaust pipe that did not work so then I made a plate for the exhaust and when I did that it held pressure thankfully. Thanks guys I cant wait to finish putting this saw back together.

 

[Vintage Engine Repairs]

It can take many many pumps to pressure the crank case and even more to pull a vacuum. Try 20 pumps before you try changing anything out.

 

[Mad Professor]

I was hoping not to have to dunk the saw in a pail of water but thankfully the intake and exhaust was leaking so I fixed the intake with a bigger bolt but for the exhaust I tried tire tube and then exhaust pipe that did not work so then I made a plate for the exhaust and when I did that it held pressure thankfully. Thanks guys I cant wait to finish putting this saw back together.

A good, well made , bicycle tire scrap inner tube works great for exhaust. Save it, many saws will have similar ex spacing.

Motor cycle tubes are more durable.........

 

[Fordsoll]

I finished putting it back together today and it seemed to run pretty well but I still need a throttle linkage before I can cut any wood.