[DeTomaso] lifter noise

[Peter Kovacs]

Yes BUT........
  the cam and lifter (and often the rest of the valve train) are designed to 
work together. It can't be assumed that you can just change the lifters without 
changing the cam and be fine. IF you had a sticky hydraulic lifter, you could 
probably pull the manifold, change out the lifters (with similar new ones) and 
be fine. If you had a solid or roller lifter cam, you could NOT likely pull the 
manifold install new hydraulic lifters and be fine. The parts have to be 
disigned to work with each other. Consider all the elements when choosing your 
solution and mechanic.
 
Peter Kovacs
209 345-6708 
209 436-2000 fx




________________________________
From: boyd casey <boyd411 at gmail.com>
To: Ken Green <kenn_green at yahoo.com>
Cc: De Tomaso List <detomaso at realbig.com>
Sent: Fri, April 1, 2011 11:46:30 AM
Subject: Re: [DeTomaso] lifter noise

Ken,
Thanks for the info. I think you saved me from a potential ripoff. I spoke
to a mechanic that owns a shop that works on exotics (mostly Porsches) and
he told me that he would have to pull the cam to change a hydraulic lifter
so I know I won't be using him!
Thanks again,
Hugh

On Fri, Apr 1, 2011 at 12:36 PM, Ken Green <kenn_green at yahoo.com> wrote:

> Mechanical lifters have a mechanical sound and I think if you listened to a
> hydraulic lifter engine and then a solid lifter engine you'd hear the
> difference pretty clearly.
>
> You don't need to pull a head or cam to change a lifter, just the valve
> cover and intake manifold, and since it's a dry intake manifold, it is much
> easier.  But you might want to make a rough measure of valve lift on all the
> valves to make sure none of the lobes have been flattened if you're hearing
> valve train noise.
>
> And, check your exhaust for leaks.  It's amazing how metallic an exhaust
> leak at the heads can sound.
>
> Ken
>
> --- On *Fri, 4/1/11, boyd casey <boyd411 at gmail.com>* wrote:
>
>
> From: boyd casey <boyd411 at gmail.com>
> Subject: [DeTomaso] lifter noise
> To: "De Tomaso List" <detomaso at realbig.com>
> Date: Friday, April 1, 2011, 8:36 AM
>
> I have what sounds like a lifter tap. I think I have hydraulic lifters but
> I
> have never had the valve covers off. First off is there an easy way to
> check
> (like through the oil fill opening ) if I have hydraulic or solid lifters?
> Secondly if they are hydraulic (my guess) is there a way to get rid of the
> noise? I have heard of hydraulic lifters collapsing , how big a job is it
> to
> replace a bad lifter? do you have to pull the heads? can it be done from
> the
> top of the motor with just the valve covers off and do you have to access
> the cam. If it is a big job I think it may be time to re power and go to
> better heads and solid lifters etc. Any suggestions would be appreciated.
> Boyd
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