Bad flat tappet lifter - Team Camaro Tech
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post #1 of 28 (permalink) Old Mar 29th, 11, 08:07 AM Thread Starter
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Mark
 
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Bad flat tappet lifter

I had another post about valve adjusting that in the process of doing so I found I have a bad lifter.

I am hoping for some advice here on how to proceed. First let me say I do not know the specs of my cam or how much use is on it. I suspect not much as the car was sitting in a garage for 18 years without being touched and when I got the car the motor appeared to be a recent rebuild. What I do know is it is a 4 bolt main, with 10 1/2:1 pistons and 1492 angle plug 64cc heads.

My thought is after inspection of all lifters if I do not find any exceesive wear on them to inspect the cam through the lifter hole, if all looks good I am going to replace all lifters and leave the old cam in.

Now for the process I want to follow to replace:
  • Pump new lifters with oil and then soak overnight
  • Install new lifters with assembly lube
  • Re-install old pushrods and rocker arms
  • Set valve lash using the EOIC method
  • Re-assemble motor
  • Set timing and follow cam break in procedure
Now go ahead and beat me up for all I missed or any other suggestions. It seems there are alot of different opinions on not replacing the cam when a lifter goes bad.

1969 Camaro SS
350/300 M20
12 Bolt 3:73 Posi

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post #2 of 28 (permalink) Old Mar 29th, 11, 08:43 AM
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Re: Bad flat tappet lifter

Is this a solid cam or hyd? I'm assuming it's hyd, since you talk about pumping them up. You will get mixed opinions on that. When you say you have a bad lifter I am again assuming hyd and it is collapsed? If it is collapsed then your plans sound good to me, if the lifter is worn out on the bottom then that would be a whole different deal.

Royce (NO XQSSS) Bradley

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post #3 of 28 (permalink) Old Mar 29th, 11, 08:44 AM
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Re: Bad flat tappet lifter

Hydraulic lifters come apart. Can you see what is wrong with it? maybe gunked up or something simple!

'67 rs - ordered new by my Grandfather
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post #4 of 28 (permalink) Old Mar 29th, 11, 08:53 AM Thread Starter
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Re: Bad flat tappet lifter

Thanks for the input so far. I noticed while setting valve lash I could push down on the end of the rocker and push the lifter in so I suspect bad lifter. If I inspect lifters and no excessive wear is evident I can't see why I would need to replace cam but many people say not to.

1969 Camaro SS
350/300 M20
12 Bolt 3:73 Posi

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post #5 of 28 (permalink) Old Mar 29th, 11, 09:41 AM
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Re: Bad flat tappet lifter

Sounds like it's collapsed. What you can try is to remove the lifter, place it in a small can of motor oil so that the lifter is covered. Then using a pushrod, pump it up and down several times. That might do the trick. Or,,,,,, prime the engine for a while and turn the crank now and then. Be sure to work the pushrod up and down too. You should be able to get that sucker to work.
Then there's the forgetabout it method. Just start it up and let it clack. Chances are fair that it'll pump up with oil. Good luck, keep us posted.

One owner 69 Camaro,(yep, bought it new
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post #6 of 28 (permalink) Old Mar 29th, 11, 10:26 AM
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Re: Bad flat tappet lifter

It might be a "good excuse" to replace the cam if you secretly want to.

'67 rs - ordered new by my Grandfather
327 L30, K-K, Deluxe int, tach & gauges, 12 bolt posi, 4 speed.

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post #7 of 28 (permalink) Old Mar 29th, 11, 10:34 AM
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Re: Bad flat tappet lifter

You could always take the lifter apart and clean it. It's not very difficult to dissasemble and reassemble a lifter.
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post #8 of 28 (permalink) Old Mar 29th, 11, 02:17 PM Thread Starter
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Re: Bad flat tappet lifter

So now I am really confused. Removed all lifters, 4 of them all from cylinder 2 & 4 I can push in with my finger with not a whole lot of pressure. The other 12 I cannot depress at all am I in the twilight zone?

1969 Camaro SS
350/300 M20
12 Bolt 3:73 Posi

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post #9 of 28 (permalink) Old Mar 29th, 11, 02:26 PM
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Re: Bad flat tappet lifter

Drain the oil out of them then maybe they will compress easily.

'67 rs - ordered new by my Grandfather
327 L30, K-K, Deluxe int, tach & gauges, 12 bolt posi, 4 speed.

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post #10 of 28 (permalink) Old Mar 29th, 11, 03:07 PM
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Re: Bad flat tappet lifter

Quote:
Originally Posted by Melrose RS View Post
Drain the oil out of them then maybe they will compress easily.
Yeah that's one of the major laws of physics; liquid is compressible.....as long as it has a place to leak out of !
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post #11 of 28 (permalink) Old Mar 29th, 11, 04:05 PM Thread Starter
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Re: Bad flat tappet lifter

I get that, why would the 4 be different than the rest?

1969 Camaro SS
350/300 M20
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post #12 of 28 (permalink) Old Mar 29th, 11, 04:44 PM
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Re: Bad flat tappet lifter

Quote:
Originally Posted by Myfirst 69SS View Post
I get that, why would the 4 be different than the rest?
Did you try applying constant pressure pushing down on the lifter for 30 seconds or more? The 4 that won't go down may have tighter clearances on the plunger ?
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post #13 of 28 (permalink) Old Mar 29th, 11, 05:16 PM
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Re: Bad flat tappet lifter

I would change all of them. Just my .02

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post #14 of 28 (permalink) Old Mar 29th, 11, 05:23 PM
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Re: Bad flat tappet lifter

For the price of a set of hyd flat tappet lifters I wouldn't bother trying to repair them. Throw a new set in, and forget about it. use the correct oil/additive abd I would treat it like a new cam and go through the break in procedure to be safe.

Royce (NO XQSSS) Bradley

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post #15 of 28 (permalink) Old Mar 29th, 11, 06:58 PM
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Re: Bad flat tappet lifter

If the motor sat for any length of time there will be at least 4 lifters that are under pressure from a valve being open. Those lifters may have leaked down and just need to be pumped back up. You could try priming the oil pump with a drill and see if they come back up. New lifters can be compressed with one finger before they're filled with oil so that's not a sign of a bad lifter. If you push them down do they spring back up? If the cam and lifters have been broke in make sure to keep all lifters in the right place if you take them out to clean them. I use those parts tags with the wire that you can twist around the lifter body.
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