Sure is quiet in here....do I need to start a fight?

[Cantdog]

Dang, that engine does not have inspection covers over the lifter gallery, need to pull the head off to get the cam out.

I know.......however if I pull the rockers and push rods, then take the cam out, I may be able to get the lifters out from the bottom.....but at this stage pulling the head is not a biggie either. I suspect it would run OK but from rudimentary measuring , it looks like it has lost over 1/8" of lift on those two lobes. This is why I don't just slap a used motor in a vehicle.......you gotta look at and touch all the bits to make sure all is well.......or not.....bores and pistons looked good.....be checking the bearings tomorrow....cam, lifters and timing chain set is in the $200 range from Summit Racing....waiting to hear back from them.......some confusion in their adds as to whether or not you have to run special valve springs to run a .416 lift cam......stock lift is .380.....

 

[Stihl 041S]

I know.......however if I pull the rockers and push rods, then take the cam out, I may be able to get the lifters out from the bottom.....but at this stage pulling the head is not a biggie either. I suspect it would run OK but from rudimentary measuring , it looks like it has lost over 1/8" of lift on those two lobes. This is why I don't just slap a used motor in a vehicle.......you gotta look at and touch all the bits to make sure all is well.......or not.....bores and pistons looked good.....be checking the bearings tomorrow....cam, lifters and timing chain set is in the $200 range from Summit Racing....waiting to hear back from them.......some confusion in their adds as to whether or not you have to run special valve springs to run a .416 lift cam......stock lift is .380.....

Machine tools are worse. Got to check every thread in the quick change. And unbuilding one can get tricky. Lol

 

[dancan]

Check pushrod length .

Mighty Mouse Logging LLC

 

[Stihl 041S]

Check pushrod length .

Mighty Mouse Logging LLC

That would be nice.....

 

[Cantdog]

Check pushrod length .

Mighty Mouse Logging LLC

You mean on the two on the worn lobes? Or all of them for wear? They will have to come out anyway so I'll look them over closely.

 

[pioneerguy600]

Mushroomed lifters and worn down cams were a Chev small block thing years back, did many and some were cause for air turning blue. If the cam could be wiggled out the lifters could be bashed back down into the cam galley.

 

[pioneerguy600]

You mean on the two on the worn lobes? Or all of them for wear? They will have to come out anyway so I'll look them over closely.

Roll them over on a pane of glass, listen for clicking noises.

 

[Cantdog]

Well now........the push rods are fine....all the same length....straight by my tablesaw top...no visible wear or any problems with them.

 

[Cantdog]

Pulled the cam so I could accurately measure the lobes.........I need ruhm......BBL....

 

[Stihl 041S]

I'll whistle while I wait........good luck.

 

[tbone75]

Pulled the cam so I could accurately measure the lobes.........I need ruhm......BBL....

That don't sound so good ?

 

[pioneerguy600]

Hope the cam bearings are still good, bit of work to change them out but doable with a cam bearing puller/installer.

 

[Cantdog]

So here are the numbers and pics from #1 cyl.....

The cam measures 1.473" at rest and that seems to be the consistent size + or - 0.0001".
So these measurements are through the first three cyls.

#1 cyl
Ex lobe at rest 1.473"
Ex lobe full open 1.583"

So that gives a cam lift of 0.o11"

The first pic is of the ex lobe, the one on the right, at full lift. The lobe on the right. The one on the left is the at rest.

 

[pioneerguy600]

That lobe is plum wore off!

 

[Cantdog]

The next pic is of the intake lobe on cyl #1

It also measures 1.473" at rest but measures 1.712" at full open.

 

[Cantdog]

I need more ruhm...BRB....

 

[Cantdog]

Ahhhh....OK...so this is cyl #2....

This one is easier to do as both the intake (on the left) and the Exhaust (on the right) are at full open very close together so one pic. tells the tale....

 

[tbone75]

Sure hope yer motor is worth a chit ?

 

[tbone75]

Ahhhh....OK...so this is cyl #2....

This one is easier to do as both the intake (on the left) and the Exhaust (on the right) are at full open very close together so one pic. tells the tale....

View attachment 520094

Not good

 

[Cantdog]

That lobe is plum wore off!

Yep......but you know I took a file to the worn lobes thinking they were soft.......couldn't touch it.......just as hard as the good lobes.

Mushroomed lifters and worn down cams were a Chev small block thing years back, did many and some were cause for air turning blue. If the cam could be wiggled out the lifters could be bashed back down into the cam galley.

Yep.....well ya know......this is a 1977 motor and that was about the same time GM had all those problems.......I 'spect probably the same cam manufacturer......as things like cams are subbed out....