Good morning my 1939 km24 has developed a rattle that seems tappity l have checked valve clearance and adjusted to the 3 tho clearance but still the rattle is there.
I wonder if anyone could have any suggestions? Is is worth taking of the timing cover off to see if anything is loose? Or could it be the small end ?
Any suggestions would be most welcome
Dave Halsall
My 55 DB500 had a rattle from rebuild . It turned out to be the push rods . wether they were the wrong ones could be anyones guess but I made my own out of bmw r45 / 65 , I think , push rods and the rattle was mysteriously cured done 500 miles now and it never returned . Dont think the ones I had were seating properly . I definitely used at least one end and the tubes from the r45 ones but cant remember if I used both ends .
one other thing that not everyone agrees with but i do . The valve clearance on an all alloy engine will increase with heat . I set my gold star valve clearance as tight as i can . as near to zero as i can get . Something to do with thermal expansion between steel and alloy . But mine works perfect .
Thanks for the information I assume the ends that locate in the tappet fit into the bmw pushrod.
Perhaps it might be worth looking at the timing gear and also removing the tin cover from the cylinder head and see if anything is loose or coming adrift and also setting to zero on clearance may help hopefully its something simple.
Your input is very much appreciated
I actually used the bmw top end and the bsa bottoms the alloy rod was the same size