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 Post subject: Twin Cam Lifters
PostPosted: Mon Oct 01, 2007 12:04 am 
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Joined: Mon Nov 24, 2003 7:09 pm
Posts: 20
Location: Monterey CA
Does anyone know how to tell a good hydraulic lifter from a
bad one?


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 Post subject:
PostPosted: Mon Oct 01, 2007 10:23 am 
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someone once told me that you should push down on them lightly while they are still in the head (but the cams removed). If they feel firm, they're good. If they feel springy, they're bad.

I have no clue if that actually works, but I used that method to replace a few of the lifters on my last race engine, and I haven't had any lifter noise (other than startup after the car has been sitting for a long time).

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I rarely visit TeamSwift anymore, so please email me if you have a question. On average I'm only checking my PM's here once a month. "roy (at) forcefed4 (dot) com"


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 Post subject:
PostPosted: Mon Oct 01, 2007 10:56 am 
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Joined: Mon May 27, 2002 11:47 pm
Posts: 1974
Location: San Juan, Argentina
Roy is right. Good lifters feel rock hard.

Just take all out, disassemble them (be careful with the steel ball and spring), clean them with paint thinner, and reassemble them with ATF oil or motor oil.

I've just made a post in the FAQ section. Check it out.

http://www.teamswift.net/viewtopic.php?t=34314

Good luck.

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 Post subject: Twin Cam Lifters
PostPosted: Mon Oct 01, 2007 11:44 am 
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Joined: Mon Nov 24, 2003 7:09 pm
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Location: Monterey CA
Thanks for the response. One engine has all hard and another has all soft. :(


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 Post subject: Twin Cam Lifters
PostPosted: Mon Oct 01, 2007 9:02 pm 
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Joined: Mon Nov 24, 2003 7:09 pm
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Location: Monterey CA
Caaarlo

How do you get them apart?

Bugiiis


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 Post subject:
PostPosted: Mon Oct 01, 2007 11:50 pm 
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Hard or soft means nothing.
If they sit for any length of time in the motor, the oil will drain out, and they will feel soft, or springy.
Look at the surface finish where the cam rides.
If there are any imperfections, or indentations, don't use them.
You can pull the plunger out with a pair of needle nose vise grips.

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 Post subject: Twin Cam Lifters
PostPosted: Tue Oct 02, 2007 1:25 am 
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Joined: Mon Nov 24, 2003 7:09 pm
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Location: Monterey CA
I have some that are soft in an engine that was being driven prior to dissasembly, although the oil pressure was going away.

Should they be replaced?


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 Post subject:
PostPosted: Tue Oct 02, 2007 1:50 am 
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Location: San Juan, Argentina
No, they should be cleaned.

However, have in mind what Suprf1y said. If the lifter surface isn't perfectly flat, or close to it, then you should replace the lifer, or... resurface the lifter. I resurfaced some of mines, and they are working ok.

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 Post subject: Twin Cam Lifters
PostPosted: Tue Oct 02, 2007 6:16 pm 
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Joined: Mon Nov 24, 2003 7:09 pm
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Location: Monterey CA
Interesting, I took lifters from both engines apart. They are different then in your picture. They don't have the smaller of he two springs and they don't have the ball.

Mine are both 1989 so maybe the early cars are different.

Bugiiis


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 Post subject:
PostPosted: Tue Oct 02, 2007 7:09 pm 
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Location: San Juan, Argentina
Hmmmm, the ball doesn't pop immediately. You have to take the small cap out and the ball-spring valve is inside.

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 Post subject:
PostPosted: Tue Oct 02, 2007 8:54 pm 
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Location: Monterey CA
OK, I found the ball and small spring.

How about this idea. If disassembled within hours of the car being driven all lifters should be hard. Soft ones at that time may be bad.

What do you think?


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 Post subject:
PostPosted: Tue Oct 02, 2007 9:13 pm 
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Location: San Juan, Argentina
You don't undestand, do you ?

Asking the same question several times won't help. They get soft because they bleed and instead of oil, they have air. Air is compressible, oil is not.

Why do they bleed ? They get dirty. Advice: Clean ALL lifters, no matter how quick they become soft.

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 Post subject: Twin Cam Lifters
PostPosted: Tue Oct 02, 2007 9:16 pm 
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Joined: Mon Nov 24, 2003 7:09 pm
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Location: Monterey CA
Sorry to disappoint you but all that I disassembled were nice and clean.


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 Post subject: Re: Twin Cam Lifters
PostPosted: Tue Oct 02, 2007 9:53 pm 
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Joined: Mon May 27, 2002 11:47 pm
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Location: San Juan, Argentina
Bugiiis wrote:
Sorry to disappoint you but all that I disassembled were nice and clean.


I don't think you will notice the microscopic dirt resting on the ball seat, when you didn't notice the valve and spring :lol:

Ok, I give up.

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 Post subject:
PostPosted: Tue Oct 02, 2007 11:06 pm 
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Joined: Mon Nov 24, 2003 7:09 pm
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Location: Monterey CA
I'm so dissapointed.


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 Post subject:
PostPosted: Sat Oct 20, 2007 5:43 am 
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Joined: Fri Sep 21, 2007 7:15 am
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lol..that was a good stoush :lol: dont feel to bad my friend..upon reading this thread and being a newbie to the complexity's of the twin cam motor, I didnt even realise the bastards were hydraulic :oops:
It now makes a hell of a lot of sense where all that noise was coming from :lol:


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