i went to crank the engine on my partially assembled 603 engine to do a compression test and i heard this pinging coming from the engine, somewhere near the valve train near piston 1. the sound was metallic and came in rhythm about twice every second. i am about 87% sure that this is a metal on metal sound but im no expert. hence this post.

my best guess is either a piston is hitting a valve somewhere. which i believe could be a timing problem. but again i could be wrong

my other guess is something in the timing mechanism.

post quickly

__________________
Current
2006 E320 CDI, 57K bought at 67K "Liesl"
1986 190E 2.3-16, 198K bought at 56K "Brigitta"
1987 300TD (Chuggin Along), 292K "Friedrich"
1995 E320 Wagon, 200K "Louisa"

Past
1987 300SDL, (sold) 125K, bought for 1$ "Kurt"

Did you check cam timing?

Did you remove the vacuum pump and belt and turn the engine?

Sixto
87 300D

when i disassembled the engine i took a punch to both the chain and the sprocket. and then matched it back up when i put he cam back in. but i will definetly check again. mabey it jumped. i can't remember if i ran it without the tensioner or not, that would have been dumb.

no i did not remove the vacuum pump belt, what would that do.

__________________
Current
2006 E320 CDI, 57K bought at 67K "Liesl"
1986 190E 2.3-16, 198K bought at 56K "Brigitta"
1987 300TD (Chuggin Along), 292K "Friedrich"
1995 E320 Wagon, 200K "Louisa"

Past
1987 300SDL, (sold) 125K, bought for 1$ "Kurt"

The vacuum pump isn't driven by the belt, it's driven by the radial cam on the IP timer. I meant remove the belt and remove the vacuum pump then see if you still hear the noise.

Sixto
87 300D

oh, okay, ya, i think that that will be my next job, thanks


but keep posting every one,

__________________
Current
2006 E320 CDI, 57K bought at 67K "Liesl"
1986 190E 2.3-16, 198K bought at 56K "Brigitta"
1987 300TD (Chuggin Along), 292K "Friedrich"
1995 E320 Wagon, 200K "Louisa"

Past
1987 300SDL, (sold) 125K, bought for 1$ "Kurt"