Leak testing

[eden]

many leak around the mag gasket too, often the air escapes through the mag studs, most leak at the exhaust gasket and many leak on the inlet. They all leak if you just use bare gaskets, that's for sure!

[alanscottj]

many leak around the mag gasket too, often the air escapes through the mag studs, most leak at the exhaust gasket and many leak on the inlet. They all leak if you just use bare gaskets, that's for sure!

Checked all gasket seals, I have used sealant and I can't find any leaks, however I have found two leaks on my tester but none on my engine! Will get the tester sealed up tomorrow and try again

[alanscottj]

Sorted the leaks on my tester, but, the needle hardly moves but over a few minutes it loses 1 psi (from 6-5) it then settles and hardly moves at all, but it does drop and settles around 3psu. I can't find any evidence whatsoever of a leak, I've sprayed the whole top end over and the mag housing, around the crank seal etc and no signs of a leak at all. What am I aiming for? 100% no movement of the dial or is there an accepted level of movement???

Many thanks as always

[eden]

It will drop slightly to start with due to compressed air heating up, the reason its goes down a little is because the air cools to room temp which results in slightly less pressure

[alanscottj]

It will drop slightly to start with due to compressed air heating up, the reason its goes down a little is because the air cools to room temp which results in slightly less pressure

So it settling at 3 would be ok? I suppose if there was a leak it would all go? After all, I can't find a leak anywhere so it should be good to go. Got rear hub bearing arriving today so can crack on with building it

Thanks all!!

[coaster]

It will drop slightly to start with due to compressed air heating up, the reason its goes down a little is because the air cools to room temp which results in slightly less pressure

So it settling at 3 would be ok? I suppose if there was a leak it would all go? After all, I can't find a leak anywhere so it should be good to go. Got rear hub bearing arriving today so can crack on with building it

Thanks all!!

Was the piston at the bottom of the stroke? If near the top perhaps it could be air leaking past the rings into the combustion chamber??

[alanscottj]

It will drop slightly to start with due to compressed air heating up, the reason its goes down a little is because the air cools to room temp which results in slightly less pressure

So it settling at 3 would be ok? I suppose if there was a leak it would all go? After all, I can't find a leak anywhere so it should be good to go. Got rear hub bearing arriving today so can crack on with building it

Thanks all!!

Was the piston at the bottom of the stroke? If near the top perhaps it could be air leaking past the rings into the combustion chamber??

I have found a leak behind the dished washer on the front sprocket, when I removed the front sprocket assembly the engine won't hold air at all, it must have been the washer itself doing the sealing, so it looks like the drive drive seal needs replacing?