ticking - no knock, just annoying.

Big Mike

Big Mike

New member
Re: ticking - no knock, just annoying.

Look if you have comp 875 lifters do not go more than 1/8 turn past zero lash, who built the motor or was this a head change? Did they or you check for coil bind? With your 1.6 rockers your looking at .534 lift. Did they or you check your push rod hole clearance in the head, it is possible they are rubbing causing problems too. I guess it is time to visit America again, bring your truck over, there is allot of help over here. I will be doing a head job on a truck soon and your welcome to check it out.
 
Richard Le

Richard Le

New member
Re: ticking - no knock, just annoying.

Quickstop [UK] said:
next question - how much damage would the truck suffer if it were driven 500 miles or so with a bad lifter, assuming that is the case? Driven gently I mean..
Click to expand...
Didn't you mention in another thread about giving the 875's 3/4 turn after zero lash? Could too much lifter preload have something to do with the noise?
 
Quickstop [UK]

Quickstop [UK]

Combating adversyty.
Re: ticking - no knock, just annoying.

Big Mike said:
Look if you have comp 875 lifters do not go more than 1/8 turn past zero lash, who built the motor or was this a head change? Did they or you check for coil bind? With your 1.6 rockers your looking at .534 lift. Did they or you check your push rod hole clearance in the head, it is possible they are rubbing causing problems too. I guess it is time to visit America again, bring your truck over, there is allot of help over here. I will be doing a head job on a truck soon and your welcome to check it out.
Click to expand...

The build was done by a reputable guy in the UK. The heads came preassembled from RPM. I didn't check for coil bind but other people have my combo and I haven't seen any reports of problems.

I know that doesn't make it right.

When I assembled the heads and the valve train, there looked to be plenty of clearance. I didn't measure anything although I could see no evidence of the push rods hitting the guide holes or any other contacts It is something I guess I will have to check.

I am almost positive that one or two of the pre loads was past 1/8 of a turn so I will do that first. Wouldn't that make it too tight, rather than too loose and thus causing a noise?

I would love to come over there - I have a plan to end up in the US eventually. :) Whereabouts are you? There are still a few states I haven't visited.

Did we meet at NATS?

Richard Le said:
Didn't you mention in another thread about giving the 875's 3/4 turn after zero lash? Could too much lifter preload have something to do with the noise?
Click to expand...

I am concerned that too much pre load initially caused the collapse of one or more lifters so now it/they don't function correctly. That is the worst case scenario. If it is a simple case of backing off the lifters then I am set.

I don't see how it could be too little load as the lifters should now be pumped up and any slack in the system should have gone.

So I am still thinking collapsed lifters at this point. If I am pessimistic then I won't be disappointed.

bezerk said:
****
Click to expand...

:D

I guess until I get my hands on the truck I won't know. I have ordered gaskets to take the lower intake off and I can get some new 875s as well. I'll check all the valve geometry at the same time and report back on the evening of 23 Dec.

Thanks for all the ideas and support guys.
 
Big Mike

Big Mike

New member
Re: ticking - no knock, just annoying.

Yes we met at Nats at one of the late night gatherings in the parking lot, I live in PA near Philly.
 
You must log in or register to reply here.
Top