Jump to content

Archived

This topic is now archived and is closed to further replies.

ISX

Tappet Cover Unveiled

Recommended Posts

ISX    58
ISX

After finding absolutely nothing on the internet for what is under that cover and lots of people wondering including myself, I put Smokeythedodge to the task of getting some pics since he has that 24V just sitting out there. He came through in a big way taking a lot of pics. You can see the pushrods going down right into the top of the lifter/tappet. You can see that some lifters are up and some are down because some are on the cam lobe.

Also gives you a sense of why you have to jam dowel rods into the lifters and pull them all up if you want to pull the cam out, otherwise the lifters that are down would hit each lobe of the cam.

Thanks again Smokey!

Posted Image

Posted Image

Posted Image

Posted Image

Posted Image

Posted Image

Posted Image

  • Like 1

Share this post


Link to post
Share on other sites
white01    0
white01

would have thought since you were in school for this you would have known.:smart:

Share this post


Link to post
Share on other sites
ISX    58
ISX

would have thought since you were in school for this you would have known.:smart:

That was industrial electricity then generators with a crash course of diesel engines.. We took an 8.3 completely apart and I remember everything but never saw any tappet cover, I don't think they had them. The CR's don't have them either. There is a difference between knowing what is under it and seeing what is under it. That's why I keep taking things off my truck. I know what stuff should look like, but I want to see it for myself so I am not working off of some "should look like" picture in a book. Most of the time it isn't even a picture but more a sketch of the engine kinda a diagram I guess, those are completely worthless to me. They will get you by, some more than others, but nothing compares to a real world picture.

Share this post


Link to post
Share on other sites
JOHNFAK    85
JOHNFAK

You can see the pushrods going down right into the top of the lifter/tappet. You can see that some lifters are up and some are down because some are on the cam lobe. Also gives you a sense of why you have to jam dowel rods into the lifters and pull them all up if you want to pull the cam out, otherwise the lifters that are down would hit each lobe of the cam.

Thanks for the pictures man ..... now explain :) I guess I didn't realize there was anything happening on the side of the block/head apart from the headstuds and maybe coolant/oil return ??? Got a diagram or some 101 for dummies to explain more .......

Share this post


Link to post
Share on other sites
ISX    58
ISX

Thanks for the pictures man ..... now explain :)

I guess I didn't realize there was anything happening on the side of the block/head apart from the headstuds and maybe coolant/oil return ???

Got a diagram or some 101 for dummies to explain more .......

I can't believe how hard it is to find something on the pushrod setup. Everything youtube and google is overhead! Did manage to find exactly what you need though.

Posted Image

So here we go John, the rockers on the valves are pushing by something.. they are pushed by the pushrods (I'll be damned right haha) the pushrods go into the lifters (tappets), the lifters are on top of the cam lobes so when the cam has a lobe, it pushes the lifter and therefore the pushrod up, and that teters the rocker teter totter, opening the valves. When the cam lobe passes, the valve springs push the rocker back up, pushing the pushrod and the lifter back down, so there is always pressure on that cam.

Got it? Let me know if you dont.

Share this post


Link to post
Share on other sites
Heavyd1980    1
Heavyd1980

that is exactly how the old 2.5 chevy 4 cyl that was in my little 87 s-10 looked. it was actually quite handy for replacing the pushrods!:thumb1:

Share this post


Link to post
Share on other sites
JOHNFAK    85
JOHNFAK

I can't believe how hard it is to find something on the pushrod setup. Everything youtube and google is overhead! Did manage to find exactly what you need though.

Posted Image

So here we go John, the rockers on the valves are pushing by something.. they are pushed by the pushrods (I'll be damned right haha) the pushrods go into the lifters (tappets), the lifters are on top of the cam lobes so when the cam has a lobe, it pushes the lifter and therefore the pushrod up, and that teters the rocker teter totter, opening the valves. When the cam lobe passes, the valve springs push the rocker back up, pushing the pushrod and the lifter back down, so there is always pressure on that cam.

Got it? Let me know if you dont.

Friggin awesome diagram (and explanation).:nadkick: (haha) !!

Sooo ..... last question ........ what does the tappet cover let you do ..... doesn't seem much space for doing anything apart from replacing the tappets ??? :shrug:

Share this post


Link to post
Share on other sites
ISX    58
ISX

Friggin awesome diagram (and explanation).:nadkick: (haha) !! Sooo ..... last question ........ what does the tappet cover let you do ..... doesn't seem much space for doing anything apart from replacing the tappets ??? :shrug:

Probably why the CR's don't have them anymore. Nothing but something to leak oil.

Share this post


Link to post
Share on other sites
Blueox01    0
Blueox01

Just hoping that fresh paint is Cummins ISX Red and not Chevrolet Orange!:nono:

Share this post


Link to post
Share on other sites
Heavyd1980    1
Heavyd1980

ISX what happen to the diagram??? i only see the little red x :banghead::banghead:

Share this post


Link to post
Share on other sites
ISX    58
ISX

Just hoping that fresh paint is Cummins ISX Red and not Chevrolet Orange!:nono:

It's not because I painted my 5spd chevy orange haha, his is red.

ISX what happen to the diagram??? i only see the little red x :banghead::banghead:

I still see it, try restarting your browser. Mine likes to do that if I leave it open too long.

Share this post


Link to post
Share on other sites
Mopar1973Man    3,696
Mopar1973Man

I can't believe how hard it is to find something on the pushrod setup. Everything youtube and google is overhead! Did manage to find exactly what you need though.

Posted Image

So here we go John, the rockers on the valves are pushing by something.. they are pushed by the pushrods (I'll be damned right haha) the pushrods go into the lifters (tappets), the lifters are on top of the cam lobes so when the cam has a lobe, it pushes the lifter and therefore the pushrod up, and that teters the rocker teter totter, opening the valves. When the cam lobe passes, the valve springs push the rocker back up, pushing the pushrod and the lifter back down, so there is always pressure on that cam.

Got it? Let me know if you dont.

Got the same problem here too... No pic... :broken:

Now at least I understand the tappet and the wooden dowel trick... I had Taz's cam cover off to change the gasket but since we where working against time I never really got a chance to look... Or shoot pics... :banghead:

Share this post


Link to post
Share on other sites
ISX    58
ISX

You guys are wearing out my pics or something :lol:, didn't work on mine today either! I saved the pic instead of linking to it so now it should work. I changed everyones links if they quoted the pic that didn't work.

Share this post


Link to post
Share on other sites
white01    0
white01

Got the same problem here too... No pic... :broken: Now at least I understand the tappet and the wooden dowel trick... I had Taz's cam cover off to change the gasket but since we where working against time I never really got a chance to look... Or shoot pics... :banghead:

LMAO...:lmao::lmao::lmao::lmao::lmao::lmao::lmao2::lmao2::lmao2::lmao2::lol::lol::lol::lmao2::lmao2::lmao2::lmao:the smiley with the stick and the machine gun:lmao::lmao::lmao::lmao::lmao::lmao::lmao::lmao::lmao::lmao::lmao::lmao::lmao::lmao::lmao:

Share this post


Link to post
Share on other sites
BoostedOne    0
BoostedOne

Sooo ..... last question ........ what does the tappet cover let you do ..... doesn't seem much space for doing anything apart from replacing the tappets ??? :shrug:

Well its not for replacing tappets... they come out through the crankcase after the cam is removed.

I got to see what was back there on mine under unfortunate circumstances...

Posted Image

Share this post


Link to post
Share on other sites
ISX    58
ISX

Well its not for replacing tappets... they come out through the crankcase after the cam is removed. I got to see what was back there on mine under unfortunate circumstances...

Dang!

Share this post


Link to post
Share on other sites
Heavyd1980    1
Heavyd1980

thanks ISX your alright i dont care what White says about ya!!!:lmao::lmao::lmao::lmao:

--- Update to the previous post...

Well its not for replacing tappets... they come out through the crankcase after the cam is removed.

I got to see what was back there on mine under unfortunate circumstances...

Posted Image

Well i wonder what the heck its for then???:shrug: and i see you got it off without removing the vp i had been told previously that it wouldnt come off unless that was removed!?!:shrug:

Share this post


Link to post
Share on other sites
Mopar1973Man    3,696
Mopar1973Man

thanks ISX your alright i dont care what White says about ya!!!:lmao::lmao::lmao::lmao:

--- Update to the previous post...

Well i wonder what the heck its for then???:shrug: and i see you got it off without removing the vp i had been told previously that it wouldnt come off unless that was removed!?!:shrug:

I don't know how he did it but I can't reach the front bolt behind the VP44... :shrug: The same applies to the 1st Gen with the VE pump you can reach the front bolt behind the pump... :shrug:

Share this post


Link to post
Share on other sites
Blueox01    0
Blueox01

Well its not for replacing tappets... they come out through the crankcase after the cam is removed.

I got to see what was back there on mine under unfortunate circumstances...

Posted Image

Access to freeze plugs/Replacing cam without pulling pan

Share this post


Link to post
Share on other sites
JOHNFAK    85
JOHNFAK

ISx/MikeSuggestion :) Make this one a sticky please - and maybe also on the website (main) as a link under general cumminsI keep comming back to this for understanding the different components ....good stuff

Share this post


Link to post
Share on other sites
ISX    58
ISX

I'll throw it in the articles section.

  • Like 1

Share this post


Link to post
Share on other sites
2500ctd    3
2500ctd

I still dont understand the wooden dowel trick? Is it to hold the tappets up? You gotta wedge em into the tappets? The more I learn the more I dont understand.:doh::lmao:

Share this post


Link to post
Share on other sites
ISX    58
ISX

I still dont understand the wooden dowel trick? Is it to hold the tappets up? You gotta wedge em into the tappets? The more I learn the more I dont understand.:doh::lmao:

The tappets go up and down, following the cams contour of the lobes. When you have to replace the cam, you can't exactly pull it out the front of the engine while the tappets are down because as you pull they will just hit the sides of the next lobe and you will never get it out. So you take a wooden dowel and jam it down into all of the tappets since they all have holes in them, and you pull them all up so that none of them will catch any cam lobes and you can pull the cam right out.

Share this post


Link to post
Share on other sites
flagmanruss    80
flagmanruss

I'm confused too about the jamming of wood into the lifters. I understand why they must be pulled. I don't recall ever having solid lifters out... With hydraulics, a handy fingernail or at most a small screwdrive could engage the spring clip grove in a Hyd Lifter & lever it up enough to grasp. I'm assuming the hole in the lifter is just an oil passage or are you using a push-rod + diameter dowel to wedge in there?

Inquiring minds want to know!

Russ

Share this post


Link to post
Share on other sites
2500ctd    3
2500ctd

The tappets go up and down, following the cams contour of the lobes. When you have to replace the cam, you can't exactly pull it out the front of the engine while the tappets are down because as you pull they will just hit the sides of the next lobe and you will never get it out. So you take a wooden dowel and jam it down into all of the tappets since they all have holes in them, and you pull them all up so that none of them will catch any cam lobes and you can pull the cam right out.

:doh: Why I thought it was for some other reason. Is it true the tappets cant be pulled out the top and must be dropped out the bottom. I think that is what really confused me. If so they must be slightly mushroomed shaped?

I'm confused too about the jamming of wood into the lifters. I understand why they must be pulled. I don't recall ever having solid lifters out... With hydraulics, a handy fingernail or at most a small screwdrive could engage the spring clip grove in a Hyd Lifter & lever it up enough to grasp. I'm assuming the hole in the lifter is just an oil passage or are you using a push-rod + diameter dowel to wedge in there?

Inquiring minds want to know!

Russ

only thing I can think of is because they are down in the block and not easy to reach. dowel probably goes into the recess and is just big and soft enough to wedge into the lifter with out damaging them.

Share this post


Link to post
Share on other sites



×