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#568812 - 02/15/05 05:45 PM Valve seal procedure - '95 Montero 3.5 DOHC  
scaesare  Offline
Wheeler
Joined: Feb 2005
Posts: 115
Ashburn, VA
It appears the '95 Montero 3.5 DOHC w/ 93K miles that I've owned for 3 days needs the valve seals. So... I've spent a number of hours here reading away, and it looks I can do them w/out reomving the heads using either the compressed air or rope method.

I've done a number of searches, and if anything I'm getting too many hits to successfully narrow downa few things. If anybody has any insight to the following, I'd appreciate it:

- Good source for a preferred (Chilton? Haynes?) service manual?

- Is there a HowTo/writeup for this procedure on this specific engine?

- What valve spring compressor is small enough to do the job on vehicele? (I've seen several suggested, but no confirmations that they did the job)

- Are there updated seals that won't harden in 60K miles?

- Is the lower plenum a must while I've got it off? (bushing issue)

- Any other insights, or anybody who has done it willing to PM?


Thanks for any helo you may be able to offer.

-Steve


-Steve
-1995 Montero SR 3.5L V6 DOHC


#568813 - 02/15/05 07:32 PM Re: Valve seal procedure - '95 Montero 3.5 DOHC [Re: scaesare]  
Winston  Offline
Rock Warrior
Joined: Feb 2005
Posts: 509
SF Bay Area
I cant help you with details of how to replace the seals, but I was wondering why you are changing them. I assume it is because you are burning a lot of oil. How much oil does your car use? My seals leak (about 1 qt per 2k mi), but oil is cheap. Are you sure the timing belt was replaced recently? The belts in your car tend to break more frequently than in the SOHC cars (my '95).


'90 Montero XLS (Sold, sadly)
'95 Montero LS 160k
'03 Montero Limited 30k

#568814 - 02/15/05 08:24 PM Re: Valve seal procedure - '95 Montero 3.5 DOHC [Re: Winston]  
scaesare  Offline
Wheeler
Joined: Feb 2005
Posts: 115
Ashburn, VA
I just got the vehicle this past weekend, and only afterward did I notice that after a few minutes idling, if starting the vehicle while warm, and then reving the engine, I get a SIGNIFICANT amount of bluish smoke, indicative of burning oil. I'm down halfway between the marks on the dipstick after 1000 miles, and no dripping, so it's being burned.

Several hours of thread reading here seems to indicate that these are classic symptoms of valve seals gone bad, and right in my milage range (over 80K). Apparently a plugged PCV valve can exacerbate the condition, but that's no easy fix either.

So, in order to have any hope of passing emissions (and not being embarassed at stop lights), I'm going to attempt to change them out.

I may well tackle the timing belt while I'm at it... I don't have clear indication that it's previously been done.


Thanks for the reply.
-Steve


-Steve
-1995 Montero SR 3.5L V6 DOHC

#568815 - 02/15/05 08:53 PM Re: Valve seal procedure - '95 Montero 3.5 DOHC [Re: scaesare]  
Winston  Offline
Rock Warrior
Joined: Feb 2005
Posts: 509
SF Bay Area
In California it is the sellers responsibility to get the smog cert. If it won't pass smog you don't have to pay. Where are you?


'90 Montero XLS (Sold, sadly)
'95 Montero LS 160k
'03 Montero Limited 30k

#568816 - 02/16/05 05:43 AM Re: Valve seal procedure - '95 Montero 3.5 DOHC [Re: scaesare]  
Anonymous
Unregistered

That's the first thing I did to mine as well. The timing belt is fairly easy to remove once you get down to the heads. There is a whoole write-up on it somewhere, keep searching. As far as manuals, splurge and find the factory service manual set. Chiltons/Haynes books suck on this vehicle and have misprints on the splark plug coil/wire order, etc. Major PITA when I was working on mine.

There is a special valve spring compressor to fit this head. The outer sides of the head are too high for anything you can get at a local parts store. Here's a link to the tool I bought. It's twenty bucks less than when I bought it two years ago.

I would definitely do the plenum as well. You're gonna have it off already, and it's a lot easier to do it once and not have to worry about it later. I didn't realize mine was bad until shortly after doing the valve seals <img src="/forums/images/graemlins/angry.gif" alt="" />. I had a mysterious vacuum leak I couldn't find until I smoke tested it.

Good luck. If you have questions I'll be happy to help with what I can.

Torry


#568817 - 02/16/05 02:18 PM Re: Valve seal procedure - '95 Montero 3.5 DOHC  
scaesare  Offline
Wheeler
Joined: Feb 2005
Posts: 115
Ashburn, VA
Torry-

Thanks for the comments. Looks like it will be a valve seal/plenum/timing belt weekend. <img src="/forums/images/graemlins/frown.gif" alt="" /> Would you be willing to estimate how long the whole job took you?

I'll grab that specific spring compressor. I also got a link to a manual in .pdf format, and I think it is the factory manual.

If anybody has any suggestions regarding finding the writeup on the procedure for this specific engine, I'd appreciate it. I've found one for a SOHC engine, but not for the 3.5 DOHC.

Again thanks.

-Steve


-Steve
-1995 Montero SR 3.5L V6 DOHC

#568818 - 02/17/05 03:56 AM Re: Valve seal procedure - '95 Montero 3.5 DOHC [Re: scaesare]  
BMT213A  Offline
Getting the Wheeling Fever
Joined: Feb 2005
Posts: 26
NJ
I'm about to attempt this repair on my '95 3.0 24V. I posted a while ago about whether the 24V motors in general have the seal issue (most refs are 12V SOHC based) but there doesn't seem to be much concensus.

I'll add in my $0.02 that I've picked up ahead of the repair:-

1) Genuine Mits vale seals seem like a good idea - the inlet and exhaust are slightly different (different part#) it seems.
2) Parts manager at the dealer advised a large socket and hammer to compress the springs. Quicker and the socket catches the retainers. Still need the spring compressor to for assembly though.
3)Several references talk about using a compression tester adaptor to pressurize the cylinders. All the compression testers I've bought have a check valve to hold the gauge reading. They don't flow air backwards!
4)You're going to have more fun with the DOHC - cams have to come out I think.
5) PCV problems may well be more to blame for the smoke than the seals. The baffles in the rocker covers can become clogged.
6)If you haven't done so already, check compression to rule out any major issues.

Hopefully after next weekend, I'll be a hardened world expert on 24V seals and have a non-smoking Monty. if so, I'll post!


Paul


#568819 - 02/19/05 01:33 AM Re: Valve seal procedure - '95 Montero 3.5 DOHC [Re: BMT213A]  
Anonymous
Unregistered

Quote

1) Genuine Mits vale seals seem like a good idea - the inlet and exhaust are slightly different (different part#) it seems.


Most definitely the case. The "new" seals are teflon coated to extend the life, however the only seal they use now is the original exhaust seal. It works on both intake and exhaust.

Quote

3)Several references talk about using a compression tester adaptor to pressurize the cylinders. All the compression testers I've bought have a check valve to hold the gauge reading. They don't flow air backwards!


If you bump the engine with the starter just like doing a compression test, this method will work.

Quote

4)You're going to have more fun with the DOHC - cams have to come out I think.


YES <img src="/forums/images/graemlins/barf.gif" alt="" />

Quote

5) PCV problems may well be more to blame for the smoke than the seals. The baffles in the rocker covers can become clogged.


Possible, but the PCV system would cause smoke slightly all the time, more heavily on acceleration. Based on the symptoms, this is a classic valve seal issue. Very common before they switched to using the same seals for intake and exhaust stems.

Good Luck on this. As far as time is concerned, mine took longer because I removed the heads. Took me about ten hours, not including time spent cleaning baffles in the valve covers. Nylon pipe brushes and lots of diesel came in handy for that. <img src="/forums/images/graemlins/wink.gif" alt="" />

Where's the PDF for the manual? I'd like to see it. Make sure that you follow the instructions for the timing belt to the "T". It'll save you alot of headache down the road. <img src="/forums/images/graemlins/cheers.gif" alt="" />


#568820 - 02/21/05 07:37 PM Re: Valve seal procedure - '95 Montero 3.5 DOHC [Re: BMT213A]  
Winston  Offline
Rock Warrior
Joined: Feb 2005
Posts: 509
SF Bay Area
I would love to hear how the seal repair went on the '95 3.0 (24 valve). How many hours, what tools were required, etc.


'90 Montero XLS (Sold, sadly)
'95 Montero LS 160k
'03 Montero Limited 30k

#568821 - 02/21/05 10:54 PM Re: Valve seal procedure - '95 Montero 3.5 DOHC [Re: scaesare]  
scaesare  Offline
Wheeler
Joined: Feb 2005
Posts: 115
Ashburn, VA
After several more hours of forum searching, Service Manual reading, and WinCaps surfing, I'm trying to narrow down a parts list for changing the valve seals on my Montero (as listed in subject).

Here's my parts list thus far, and a few more questions if I may:

DESCRIPTION PART # QTY COST
Timing Belt tensioner pully - L MD140071 1 24.59
Timing Belt tensioner pully - R MD319022 1 22.71
Lower Intake Plenum MD335940 1 299.56
Timing Belt MD193875 1 94.9
Intake Manifold Plenum Gasket MD300483 1 4.33
Induction Control Valve Gasket, Secondary MD307582 1 3.59
Induction Control Valve Gasket, Primary MD307583 1 5.38
Sparkplugs MS851335 6 10.4
Spark plug Wire set MD311208 1 54.54
exhaust seals MD307343 12 3.21
intake seals MD306079 12 3.17
PCV valve MD183547 1 12.69
Cam Seals MD152603 4 6.58
Throttle Body Gasket MD184662 1 2.17
EGR Pipe Gasket MD149764 2 4.19
Water Pump MD972440 1 101.7
Timing Belt Hydraulic Tensioner MD319040 1 89.58
Spark Plug Seals MD186787 6 3.88
Rocker Cover Gasket MD186786 2 20.18

Valve Spring Compressor (Schley Products) 91400 1


- One reply by SRMan suggest that there is a writeup for this procedure on the 3.5L DOHC, but I've been unable to find it. Does anybody know definitivley where it may be?

- I grabbed the part #'s for the tensioner pulleys from WinCaps, but is there an entire 'tensioner assembly' that needs to be replaced instead?

- WinCaps lists MD30343 as the part number for the valve seals, and has quantity 12. It also has another indicator the 'same' part on the illustration, and specifies quantity 24, but no part #. I've seen one comment that Mits has gone to a newer teflon-seal for both intake and exhaust, is this why thy quantity change w/ no part # update?

- For my DOHC engine, the cams have to come off. I assume this means new cam seals on the sprocket ends, correct?

- Anybody know where the part # on the updated lower plenum is stamped? I'm trying to see if I already have the new one.


Thanks again for all the help this far. When I tackle it, I'll try to document the procedure for others.

(ON EDIT: I've updated a couple of part #'s, and added the rocker cover gaskets, which I had forgotten earlier. I've also added the individual item costs from mitsubishiparts.com, as of 4/2005. The total cost for all these parts with the quantities indicated was just about $1000, which was %50 less than dealer costs)

Last edited by scaesare; 05/11/05 07:27 PM.

-Steve
-1995 Montero SR 3.5L V6 DOHC

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