Prev: CARBURETORS ;^(
Next: The front seat is doing a squeak noise
From: Tegger on 26 Mar 2007 19:13
"Ray O" <rokigawaATtristarassociatesDOTcom> wrote in
news:849a3$46082e3e$44a4a10d$8974(a)msgid.meganewsservers.com:

>
> "Jimbo" <jfroche(a)gmail.com> wrote in message
> news:1174939013.333582.276400(a)o5g2000hsb.googlegroups.com...
>> How is the valve lash/clearance adjusted on a 97 Tercel? One source
>> suggested shims but most others said screwdriver and wrench
>> adjustment. The only concern was to do them while the engine is hot.
>> Can anyone clarify?
>>
>> Thanks.
>>
>> Jim
>>
>
> The subject on your post suggest that your 1997 Tercel is burning oil
> on startup. Adjusting valve lash will not affect oil consumption.
>
> With DOHC and 4 valves per cylinder, my guess is that valve lash is
> adjusted with shims, and yes, valve lash should be adjusted while the
> engine is hot.



Valve lash is adjusted **COLD**.

The only time you would EVER adjust valves with the engine hot is on
pushrod engines. Pushrods lengthen with heat, so you have to adjust the
clearances when they're at their longest.

--
Tegger

From: Tegger on 26 Mar 2007 19:16
"Jimbo" <jfroche(a)gmail.com> wrote in news:1174939013.333582.276400
@o5g2000hsb.googlegroups.com:

> How is the valve lash/clearance adjusted on a 97 Tercel? One source
> suggested shims but most others said screwdriver and wrench
> adjustment.



Your engine uses shims on top of the valve spring buckets. Adjustment is a
time-consuming job, but rarely needs to be done if the oil has been changed
regularly.

Check the clearances before thinking you need to adjust them.



> The only concern was to do them while the engine is hot.
> Can anyone clarify?
>


Adjust **COLD**!

And if you're burning oil on startup, your valve guide oil seals are shot.
This is usually due to insufficiently frequent oil changes.


--
Tegger

From: Hammo on 26 Mar 2007 23:50



On 27/3/07 9:13 AM, in article Xns98FFC378546FEtegger(a)207.14.116.130,
"Tegger" <tegger(a)tegger.c0m> wrote:


>>
>> The subject on your post suggest that your 1997 Tercel is burning oil
>> on startup. Adjusting valve lash will not affect oil consumption.
>>
>> With DOHC and 4 valves per cylinder, my guess is that valve lash is
>> adjusted with shims, and yes, valve lash should be adjusted while the
>> engine is hot.
>
>
>
> Valve lash is adjusted **COLD**.

I can appreciate why that may be the case, however, my Corolla 4AC requests
the motor, warmed to normal op temp.
>
> The only time you would EVER adjust valves with the engine hot is on
> pushrod engines. Pushrods lengthen with heat, so you have to adjust the
> clearances when they're at their longest.

That is one reason. How were those push rods operated?

Hammo

From: Jimbo on 27 Mar 2007 09:16
On Mar 26, 6:07 pm, "Ray O" <rokigawaATtristarassociatesDOTcom> wrote:
> "Jimbo" <jfro...(a)gmail.com> wrote in message
>
> news:1174943839.309436.39920(a)n59g2000hsh.googlegroups.com...
>
> > On Mar 26, 4:30 pm, "Ray O" <rokigawaATtristarassociatesDOTcom> wrote:
> >> "Jimbo" <jfro...(a)gmail.com> wrote in message
>
> >>news:1174939013.333582.276400(a)o5g2000hsb.googlegroups.com...
>
> >> > How is the valve lash/clearance adjusted on a 97 Tercel? One source
> >> > suggested shims but most others said screwdriver and wrench
> >> > adjustment. The only concern was to do them while the engine is hot.
> >> > Can anyone clarify?
>
> >> > Thanks.
>
> >> > Jim
>
> >> The subject on your post suggest that your 1997 Tercel is burning oil on
> >> startup. Adjusting valve lash will not affect oil consumption.
>
> >> With DOHC and 4 valves per cylinder, my guess is that valve lash is
> >> adjusted
> >> with shims, and yes, valve lash should be adjusted while the engine is
> >> hot.
> >> --
>
> >> Ray O
> >> (correct punctuation to reply)
>
> > In my eagerness to simplify my message, maybe I oversimplified :(
>
> > First thing I noticed was that oil consumption between changes had
> > increased but not hugely. Then I noticed the engine at idle had
> > become noisier although none of the other members of the household
> > agree with me about that. Then I noticed the smoke at startup. I
> > figured the noise was associated with the valve gear and linked that
> > to the burning oil in the morning. Hence my oversimplified
> > question :) So I guess I'm looking at worn valve stem seals for the
> > oil consumption and smoke. Any clues about the noise on this engine?
>
> If the smoke is only apparent at startup and the smoke is blue-grey color,
> then leaking valve stem seals are a likely cause.
>
> Noises are difficult to diagnose without actually hearing them first hand.
> If the noise is coming from under the timing cover, you may be hearing the
> timing belt slapping, especially if it has been more than 60,000 miles since
> the timing belt was replaced.
> --
>
> Ray O
> (correct punctuation to reply)

Hmmm .... timing belt? The previous owner told me it had been
replaced and that was just about 60,000 miles ago. Maybe its time to
do that anyway.

From: Ray O on 27 Mar 2007 12:56

"Jimbo" <jfroche(a)gmail.com> wrote in message
news:1175001400.415578.241620(a)y66g2000hsf.googlegroups.com...
> On Mar 26, 6:07 pm, "Ray O" <rokigawaATtristarassociatesDOTcom> wrote:
>> "Jimbo" <jfro...(a)gmail.com> wrote in message
>>
>> news:1174943839.309436.39920(a)n59g2000hsh.googlegroups.com...
>>
>> > On Mar 26, 4:30 pm, "Ray O" <rokigawaATtristarassociatesDOTcom> wrote:
>> >> "Jimbo" <jfro...(a)gmail.com> wrote in message
>>
>> >>news:1174939013.333582.276400(a)o5g2000hsb.googlegroups.com...
>>
>> >> > How is the valve lash/clearance adjusted on a 97 Tercel? One source
>> >> > suggested shims but most others said screwdriver and wrench
>> >> > adjustment. The only concern was to do them while the engine is
>> >> > hot.
>> >> > Can anyone clarify?
>>
>> >> > Thanks.
>>
>> >> > Jim
>>
>> >> The subject on your post suggest that your 1997 Tercel is burning oil
>> >> on
>> >> startup. Adjusting valve lash will not affect oil consumption.
>>
>> >> With DOHC and 4 valves per cylinder, my guess is that valve lash is
>> >> adjusted
>> >> with shims, and yes, valve lash should be adjusted while the engine is
>> >> hot.
>> >> --
>>
>> >> Ray O
>> >> (correct punctuation to reply)
>>
>> > In my eagerness to simplify my message, maybe I oversimplified :(
>>
>> > First thing I noticed was that oil consumption between changes had
>> > increased but not hugely. Then I noticed the engine at idle had
>> > become noisier although none of the other members of the household
>> > agree with me about that. Then I noticed the smoke at startup. I
>> > figured the noise was associated with the valve gear and linked that
>> > to the burning oil in the morning. Hence my oversimplified
>> > question :) So I guess I'm looking at worn valve stem seals for the
>> > oil consumption and smoke. Any clues about the noise on this engine?
>>
>> If the smoke is only apparent at startup and the smoke is blue-grey
>> color,
>> then leaking valve stem seals are a likely cause.
>>
>> Noises are difficult to diagnose without actually hearing them first
>> hand.
>> If the noise is coming from under the timing cover, you may be hearing
>> the
>> timing belt slapping, especially if it has been more than 60,000 miles
>> since
>> the timing belt was replaced.
>> --
>>
>> Ray O
>> (correct punctuation to reply)
>
> Hmmm .... timing belt? The previous owner told me it had been
> replaced and that was just about 60,000 miles ago. Maybe its time to
> do that anyway.
>

I believe that the timing belt replacement interval is 60,000 miles under
severe conditions - frequent short trips, idling, towing, etc. That said,
the timing belt may not be the source of the noise.
--

Ray O
(correct punctuation to reply)


First  |  Prev  |  Next  |  Last
Pages: 1 2 3 4
Prev: CARBURETORS ;^(
Next: The front seat is doing a squeak noise