Quote:
Originally Posted by vstech
so... on the MULTITUDE of motors on this site, when the valve does NOT rotate, it's a sign of stuck rotators? worn valve faces/seats? HMMM...
anybody with the FSM know if the spring wrench is supposed to TURN the valve face during adjustment? interesting...
maybe on a newly purchased car, or one that's been too long between adjustments, set the gap, then rotate the valve, then start the motor, then repeat... hmmm....
I have several 30mm sockets, I could cut a few sections off of it, and weld them to a handle...
|
I don't know if a non-turning valve is a sign of a non-working rotocap. It depends on the friction force of the valve adjusting nuts vs. the valve spring force.
The spring wrench should not turn, but I usually see it moving a bit until it blocks against a injector, cam tower or thread of the valve cover.
Quote:
Originally Posted by Army
@Govert - at how many miles did they stop working on your engine?
Do you think that if they weren't trapped in those muck capturing recesses and were kept cleaner they might have lasted longer?
When I spoke with the machine shop / engine rebuilder who did the work for my engine I think he said that in his experience they didn't fail that often. So long as they move freely they're good.
EDIT - some perspective perhaps? Mine were all good at about 100,000 miles
|
My engine has run about 200,000 km (roughly 125,000 miles) for certain, probably more. Even the working rotocaps didn't feel as springy as the new ones. The non-working ones weren't springy at all, but they all could rotate. I did a compression leak test on my engine and you could hear when you rotated the valves that some of them weren't worn evenly. I could hear air leakage increasing and decreasing when I turned the valves, so the non-working rotocaps did have an effect.
They would probably last longer if they weren't in those recesses, where there is an oily-soot build up, I've heard that from an W123 expert too.
Quote:
Originally Posted by Army
As far as I can see the FSM doesn't say that the 30mm cap should turn. Even chapter 05-250 which says that the rotorcaps should be replaced on high mileage engines does not specifically say make sure that they still turn. Well it doesn't say so in the English version. I understand Govert uses the original German version quite a bit. I have a copy too but need to start Windows to access it. I usually save up my German FSM reading so I only have to suffer microsoft products once in a while! (I'll put it on my list)
|
I have to start Windows too for my German FSM. It doesn't say so either, it is sort of implied if the FSM says that they should be replaced on high-mileage engines. The only question is: what is high mileage according to MB? The original service booklet goes up to 200,000 km, so perhaps that is considered high mileage.
02-15-2012, 09:25 AM
Hybrid Mode
