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PostPosted: 21 Sep 2014 16:43 
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Joined: 13 Jul 2009 16:44
Posts: 31
Country: Trinidad and Tobago
Hi ,

My 2nd Gen 4g92 dohc mivec-md is having a problem with the tappets(lifters) making noise....Can these be adjusted? Can anyone tell me the standard clearance for them please?

Sean


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PostPosted: 22 Sep 2014 03:21 
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Joined: 29 Mar 2009 13:11
Posts: 370
Location: Co. Cork
Country: Ireland
Try cleaning them the next time you're doing an oil change.
Remove each one, preferably (but not essentially) in a noted order.
Degrease them and soak them in petrol for up to an hour with periodic agitation and compressing them under the meniscus of the fluid. You should see particulate dirt exuding.
Change the fluid as necessary once it becomes dirt saturated and continue the cleaning process as before.
Once you're satisfied with the cleanliness, you can use compressed air to accelerate the drying process, or simply air dry.
Ensure all parts are clean before reinstalling and oil prime the tappets before replacing.

Most people would use diesel for safety and reduced volatility, but petrol has better solvency for this job. Ensure you've adequate ventilation, away from sources of ignition and wear non-permeable gloves.

If you want something to further quieten them, PM me.


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PostPosted: 22 Sep 2014 17:27 
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Joined: 04 Jul 2005 13:25
Posts: 1209
Location: Lower Hutt
Country: NZ
Eh what?

No, they're not hydraulic so there's nothing to clean and you're not going to take them out either.

The adjustment spec is in the manual somewhere.
It's about 0.1mm ish or 0.15 mm ish from memory.

Steve

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6G72 mivec Twin TDO5 20Gs up and running.
6G72 mivec bored and stroked to 3.4 litres...Frankenmitsi build
6G74 mivec bored and stroked to 3.9 litres....Frankenmitsi build.
6G75 under construction....4.2 litres bored and stroked.Another Frankenmitsi.


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PostPosted: 23 Sep 2014 03:54 
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Joined: 13 Aug 2011 12:33
Posts: 381
Country: ireland
Mitsubitchy wrote:
Try cleaning them the next time you're doing an oil change.
Remove each one, preferably (but not essentially) in a noted order.
Degrease them and soak them in petrol for up to an hour with periodic agitation and compressing them under the meniscus of the fluid. You should see particulate dirt exuding.
Change the fluid as necessary once it becomes dirt saturated and continue the cleaning process as before.
Once you're satisfied with the cleanliness, you can use compressed air to accelerate the drying process, or simply air dry.
Ensure all parts are clean before reinstalling and oil prime the tappets before replacing.

Most people would use diesel for safety and reduced volatility, but petrol has better solvency for this job. Ensure you've adequate ventilation, away from sources of ignition and wear non-permeable gloves.

If you want something to further quieten them, PM me.



I bet ya did read 4g92 as 93 Sean ;)

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....internet....salesmen.....bullshit.....dumb kids.....they all go together.


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PostPosted: 23 Sep 2014 04:20 
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Joined: 29 Mar 2009 13:11
Posts: 370
Location: Co. Cork
Country: Ireland
When I hear lifters, I automatically think 4G93 :lol:

0.1mm intake, 0.2mm exhaust


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PostPosted: 23 Sep 2014 12:56 
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Joined: 04 Jul 2005 13:25
Posts: 1209
Location: Lower Hutt
Country: NZ
That's what happens when you call parts by their wrong names.
They're actually "lash adjusters".

Lifters have been around since the days of sidevalve engines.
The cam mounted in the block "lifts" the lifters which in turn "lifts" the valves.
Then engines developed onto OHV which means pushrods and rockers.
You still have "lifters" which run on the cam and lift the pushrods.
The early ones were mechanically adjusted but later ones had automatic adjustment via oil pressure.

So, in the case of Mitsubishi and DOHC, there's no such thing as "lifters" because the cam directly runs on the rocker arms which operate the valves. The "lash adjusters" do one thing only which is to adjust the lash. With a normal DOHC, they're hydraulicly adjusted but they're in the block( I mean head) and don't lift.
With mivec, the adjuster is on the end of the rocker.

So, moral of the story, if you want to try to be professional........learn the correct names for the parts to avoid confusion.
Most of the "dumbness" comes from US of A where the small block chev is the norm but there's really no comparison to a modern jap engine that makes 4 times the power per litre.

Steve

_________________
6G72 mivec Twin TDO5 20Gs up and running.
6G72 mivec bored and stroked to 3.4 litres...Frankenmitsi build
6G74 mivec bored and stroked to 3.9 litres....Frankenmitsi build.
6G75 under construction....4.2 litres bored and stroked.Another Frankenmitsi.


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PostPosted: 24 Sep 2014 00:54 
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Joined: 13 Aug 2011 12:33
Posts: 381
Country: ireland
Tappets maybe? :) :) :)

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....internet....salesmen.....bullshit.....dumb kids.....they all go together.


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PostPosted: 26 Sep 2014 03:57 
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Joined: 11 Aug 2014 13:59
Posts: 1
Country: guatemala
Im having the same problem, could anyone tell me the the adjustment specs for the lash adjusters on my Asti Zr 96 4g92 mivec doch, thanks

regards


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