Makes no sense. What am I missing

[D_Mac 8,619]

Never !!! We got the engine pulled out of the 875. Won't be long now !!

Edited August 6, 2021 by D_Mac

[squonk 41,118]

20 hours ago, D_Mac said:

Never !!! We got the engine pulled out of the 875. Won't be long now !!

Let me know. I may need to see if that old block is any good.

[squonk 41,118]

Tore down the"parts" engine. Looks pretty good except the oil was last changed when Lucy was a twinkle in Desi's eye. I have started to clean the inside of the block to apply the handyman's secret crack detector, carb cleaner. Crank looks good. The camshaft came right out. No sign of the shim!  I am not sure if I'm going to use this cam. There is an imprint of the exhaust lobe on the tappet that you can feel with your fingernail. I was always taught not to use a tappet or lifter from one cam to another.  

 

 

You can just make out the impression from the middle of the "E" to the middle of the bottom line of the "E" 

 

[ebinmaine 67,498]

I'd agree with not using the cam having been taught the same. 

That cam might be saved and even enhanced a little by grinding. Someone like @Greentored could comment there. 

 

 

AS a side note you have (2) 8 HP Kohler engines with broken governors. 

I found today that the one that is original to The Military Tribute Tractor has a broken governor and the exhaust valve sticks. 

I won't be able to get into that engine for quite a while. 

 

I'll be looking forward to seeing your outcome on this project. 

 

[squonk 41,118]

18 minutes ago, ebinmaine said:

 

 

I'll be looking forward to seeing your outcome on this project. 

 

We can have a race! My engine vs. Colossus! 

[ebinmaine 67,498]

4 minutes ago, squonk said:

We can have a race! My engine vs. Colossus! 

I'm thinking you'll be done first. 

[rjg854 11,361]

Uuhmm yeah 

[Greentored 3,210]

On 8/7/2021 at 2:54 PM, ebinmaine said:

I'd agree with not using the cam having been taught the same. 

That cam might be saved and even enhanced a little by grinding. Someone like @Greentored could comment there. 

 

 

 

 

Keeping the lifters and corresponding cam lobes 'matched' is absolutely correct, especially in the automotive world.  Same for rockers, pushrods, etc...  New lifters on old cam= ok. New cam and old lifters= no no.

I'll be honest with you guys- I have never done it on a small engine, and never matched pushrods and rockers in an automotive application either and never had any issues.  BUT, keeping them in order IS the recommended way to do it.

In this case, id slap a new set of lifters in it just for peace of mind and send it.

If you do want some more oomph, a custom grind on that cam will really wake it up. I tried doing it on my own, the payoff was impressive but the labor was painstaking and not repeatable.

Edited August 9, 2021 by Greentored

[squonk 41,118]

For the curious, here is the picture of the cracked bearing boss.

 

[Handy Don 12,230]

1 hour ago, squonk said:

For the curious, here is the picture of the cracked bearing boss.

 

So that took a serious impact to break.

[ebinmaine 67,498]

6 minutes ago, Handy Don said:

So that took a serious impact to break.

Dropped perhaps?

[squonk 41,118]

27 minutes ago, ebinmaine said:

Dropped perhaps?

I'm thinking it happened when the "previous owner installed the bearing. Probably got it wedged and whacked it .

[ebinmaine 67,498]

1 minute ago, squonk said:

. Probably got it wedged and whacked it .

Ahhhh yes. 

[pfrederi 17,739]

Don't need no magna flux to see that...

[Gregor 4,846]

What is the red stuff on there to make it show up like that?

[squonk 41,118]

3 hours ago, Gregor said:

What is the red stuff on there to make it show up like that?

Dye and developer. We wanted to see if the crack continued around the base of the boss.

Edited August 9, 2021 by squonk

[Gregor 4,846]

On 8/9/2021 at 5:54 PM, squonk said:

Dye and developer.

Maybe another stupid question. Are you talking hair dye?

[richmondred01 2,237]

I’ve only seen those bosses broken once or twice in 40 years.

I agree my guess is someone got heavy handed knocking in the bearing. 
I always put the bearing in the freezer over night. Same with the guides. 
learned that from the model A’s and flathead fords. 

[Snoopy11 5,714]

You know what I see... a little less obvious I know... but

 

Wear on the cam... pointed out in the picture...

 

Perhaps a little bit of oil loss there. What is odd is... my cams don't show wear like that, even with thousands of extra rpms. Perhaps someone used a cheap... and/or crappy oil?

 

Don

[squonk 41,118]

9 hours ago, Snoopy11 said:

You know what I see... a little less obvious I know... but

 

Wear on the cam... pointed out in the picture...

 

Perhaps a little bit of oil loss there. What is odd is... my cams don't show wear like that, even with thousands of extra rpms. Perhaps someone used a cheap... and/or crappy oil?

 

Don

The shim that rides on that end was missing.

[squonk 41,118]

Another fly in the ointment. One piece camshaft with 2.02" exhaust tappet. Tappet is on base circle of cam. Look how high the valve sits. That is a heck of a lot to grind off when setting the lash! 

 

 

The other engine I had had a 1 piece cam but it had a 1.96" tappet in it so I put that one in and look at the difference. Much more what I would have expected before grinding the stem to set lash.

 

So did the 1 piece cam use a 2.02" or a 1.96" exhaust tappet? 

 

[richmondred01 2,237]

One piece cam used the 2.02 tappet. 
exhaust valve length 4.056

Edited August 21, 2021 by richmondred01

[squonk 41,118]

2 hours ago, richmondred01 said:

One piece cam used the 2.02 tappet. 
exhaust valve length 4.056

I will measure the valve. The valve being used was in the engine when there was a 2 piece cam in it. The valve on my other engine which had a 1 piece cam appeared to be the same length. It also had the 1.96" tappet. Possibly previous hands mixed and matched parts? Was there a different exhaust valve length with the 2 piece cam?

Edited August 21, 2021 by squonk

[richmondred01 2,237]

Lots of parts swapping goes on. I got in a NOS stock k321 last week from a cadet. The guy said it run but the rpm couldn’t be controlled. 
I figured it was the governor cross rod tab right? 
I pulled the pan and saw that someone had removed the governor from a brand new engine. They must have pried it out because the cross shave and mounting pin were bent. 
Crazy. 

Edited August 22, 2021 by richmondred01

[squonk 41,118]