Popping from engine when turning crank by hand

sicknoto · Post by **sicknoto** » 29 Jul 2021, 15:12

Hi all

I am hearing a pop coming from around my exhaust cam area when I turn the crank by hand. It sounds almost like opening a corked bottle.

Thanks

Nicm

Post by **FlyingVolvo** » 29 Jul 2021, 15:27

Do you have the spark plugs in still? I had a little pop and hiss when hand cranking my engine once, I assumed it was just the cylinders pressurizing a little and then releasing.

sicknoto · Post by **sicknoto** » 29 Jul 2021, 15:30

No the spark plugs are out right now

Post by **volvolugnut** » 29 Jul 2021, 16:09

What is the engine history? Has the timing belt been removed or loosened since it ran? Any other thing that may change valve timing?
volvolugnut

sicknoto · Post by **sicknoto** » 29 Jul 2021, 16:11

I had to replace the tensioner and water pump

Post by **volvolugnut** » 29 Jul 2021, 17:58

Do the timing marks for both cams and the crankshaft line up as required? If not, you can have valve to piston interference.
volvolugnut