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#568822 - 02/22/05 09:25 AM Re: Valve seal procedure - '95 Montero 3.5 DOHC [Re: scaesare]  
Anonymous
Unregistered

Quote
Exhaust valve guide seals MD307343(?) 24 (?)


This is correct. I had to double check with the dealer (I actually called 2 different dealers to ensure one was feeding me a line of BS) because I don't trust parts guys, having been in the parts business for awhile.

As far as the write-up is concerned, about two years ago there was another guy doing his 3.5 DOHC about two weeks after I did mine. He said he was planning on doing a write-up at that, with pics and all. Whether or not he actually did I don't know. I lost track of this board for awhile and just recently rediscovered it.

The tensioner assembly is a major PITA. make sure you follow the procedure in the book on that one. It calls for inserting a pin through the pushrod and tensioner housing. A closely fitting cotter pin works great for this. Just make sure you have it positioned with the "loop" end towards you.

Also, have fun on the bracket bolts for the AC <img src="/forums/images/graemlins/zombie.gif" alt="" />. Just when you think they are all out (because you just removed the impossible one), there is one more even more difficult to get to. <img src="/forums/images/graemlins/evil.gif" alt="" />

I'll pm you with my home phone # so you can ring me if you need ideas for reaching those crappy locations. Oh, and some of the bolts you'll be removing are easier to access through the wheel wells. Put the truck on jackstands and remove the front wheels.

Do you know when the water pump was replaced, if it was replaced? If it hasn't been done, I would recommend doing it now as well. Tearing that engine down that far again is something you won't want to do any time soon, I promise! <img src="/forums/images/graemlins/barf.gif" alt="" />



#568823 - 02/23/05 02:24 AM Re: Valve seal procedure - '95 Montero 3.5 DOHC [Re: Winston]  
BMT213A  Offline
Getting the Wheeling Fever
Joined: Feb 2005
Posts: 26
NJ
Still a work-in-progress on the 24V SOHC front. No claims as yet, that Monty has quit smoking...

Progress/observations so far:-
1) (This is the one that caused the delay of play) A dry run of pumping ~100psi into the cylinders showed a leak down rate of 7.5 to 8.5 psi/min seemingly past the rings into the crankcase (blowing back up the oil galleys in fact) ! This is from a compressor rated at 4cfm at 90psi. All the posts I'd read said the air requirement would be minimal, and at first this seemed excessive and contradictory to the decent compression readings (190psi min). I really wondered if the oil consumption was unrelated to the valve seals. Some subsequent thinking though convinced me this might not be unreasonable for a stone cold, idle motor. I plan to either spin the motor or shoot some oil into the bores and repeat the test.

2) My spring compressor is too big to get anywhere close to the inlet valves. The solid coolant tube running front to back interferes with access. Schley unit now on order...

Stay tuned for next weekend's episode...

Paul


#568824 - 03/01/05 07:31 AM Re: Valve seal procedure - '95 Montero 3.5 DOHC [Re: scaesare]  
ryany  Offline
Body Damage is Cool
Joined: Feb 2005
Posts: 1,508
Phoenix, AZ
I'm in the middle of my valve job, waiting on the machine shop and parts ordered from Mitsubishi. I'm curious to know how yours is coming. I determined that there was no way I could get the valve springs off with the heads still on the block with any of the 3 valve spring compressors I have, so the heads came off. Even with the head laying on my workbench, I still had to create an extension out of an old spark plug socket so my valve spring compressor could compress the springs. Before I took the heads to the machine shop for a valve job, I broke out the trusty Dremel moto-tool and cleaned up all the rough finishes on the ports, and matched the ports on the intake & exhaust manifolds to the ports on the heads. By the way, the dealer had separate part numbers for the intake & exhaust valve seals. (intake:MD306079, exhaust:MD307343) I also decided to do all the valve cover gaskets while I was in there, along with the belts, water pump, thermostat, and all cooling system hoses, even though there was no sign of a problem with any of them. (it would be silly not to do the water pump while you're there) Let me know if you need part #'s for any of these.


95 Montero SR 3.5
OME shocks & springs, cranked torsion bars, 2" body lift, 3" gas tank lift, 4.90 gears, Aussie front locker, factory rear locker, Aisin manual hubs, Roger Brown Rock Sliderz, 315/75r16 (35") BFG Mud-Terrain KM2s on 16x8 Eagle Alloys, custom 2 1/4" exhaust with Magnaflow muffler

#568825 - 03/01/05 03:41 PM Re: Valve seal procedure - '95 Montero 3.5 DOHC [Re: ryany]  
scaesare  Offline
Wheeler
Joined: Feb 2005
Posts: 115
Ashburn, VA
Ryany-

Thanks for the post... sorry to hear that you ended up having to pull your heads.

Out of cuiosity, were any of the valve-spring compressors you tried the one mentioned above (Schley Products #91400)?

It seems there is contradictory info regarging whether the seals for intake & exhaust are all the same part # these days.

Thanks for the reminder about the water pump, that will go as well. If you do have the part # handy, that would be great. I've listed the other part #'s I believe to be correct in a post above... if anything you have differs, I'd be interested as well.

Thanks again.


-Steve
-1995 Montero SR 3.5L V6 DOHC

#568826 - 03/03/05 03:36 AM Re: Valve seal procedure - '95 Montero 3.5 DOHC [Re: ryany]  
BMT213A  Offline
Getting the Wheeling Fever
Joined: Feb 2005
Posts: 26
NJ
Still a Work in progress on the 95 3.0, but I'm happy to share a few updates:-

1) Schley spring compressor does fit, although I had to shorten the pivot bar by about ~3 inches to enable easy location/set up within the bay.

2) Big drawback to the Schley unit is that it doesn't "latch". i.e. you have to keep pressure on the lever to keep the spring compressed. Sounds trivial, until you are bent over, applying force with your left hand and trying to relocate keepers with tweezers/mag pick up/fingers in your right. After the 6th valve, I rigged a few blocks of wood to wedge the lever and hold the spring compressed. Much easier...

3) The leakdown rate on at least one of my cylinders was too high (and thus hold pressure too low) to break the spring loose from the inlet valves (exhaust were OK though). I kept pushing the valve open and venting air through the inlet. The problem is that after a few attempts, I seem to get enough debris in/on the valve seat to ensure the max pressure achievable is relatively low (60psi). Still haven't quite cracked this one yet, but I'm hoping a week of (4) will help.

4) A liberal helping of WD40 (or pentrating oil of choice) around the keepers helps to break the spring loose of the keepers/valve retainer , especially the inlets (surprised me these would actually stick - errant combustion deposits I assume)

5) Beware of leaving the sealing ridge of the old valve guide in place. They seem to rip off when the old guide is pulled off.

6)If pushed, I'd say the old inlet seals were in visually worse shape than the exhaust. Sort of agrees with the sticky retainers. I'm more (but not yet 100% convinced) this is the root cause of my Monty's smoking habit.

7)FYI, I'm replacing with different inlet/exhaust part numbers based on the local stealer parts guru. MD184303 for exhaust, MD307342 for inlet. BTW, the Mits bag ID calls these "exhaust guides" even though they are inlets. Physically, they look the same except for the seal color.

8) Whatever you do, BLOCK the oil feeds. I "launched" one set of keepers by prematurely releasing the spring. One would have ended up in the sump had I not blocked the oil feed.


Paul


#568827 - 03/03/05 05:48 AM Re: Valve seal procedure - '95 Montero 3.5 DOHC [Re: scaesare]  
ryany  Offline
Body Damage is Cool
Joined: Feb 2005
Posts: 1,508
Phoenix, AZ
I didn't see that post until the day after I pulled the heads, so I didn't have the opportunity to try the Schley Products tool.
The water pump part # is MD972440, and comes with the necessary gasket & o-ring. I wonder if the valve seal confusion could be due to different part #'s for the different engines (i.e. 3.0-24 valve, 3.0-12 valve, 3.5)? I was looking at the parts guy's screen when we were ordering parts and can vouch for the accuracy of the 2 separate part #'s, providing the info in his catalog was current & accurate (the parts department at the Nissan dealership that I used to work at got catalog updates every month from Nissan).
I should be getting my heads back from the machine shop tomorrow and may be able to get my Montero back together this weekend. Keep updating this thread with any useful experiences or info.


95 Montero SR 3.5
OME shocks & springs, cranked torsion bars, 2" body lift, 3" gas tank lift, 4.90 gears, Aussie front locker, factory rear locker, Aisin manual hubs, Roger Brown Rock Sliderz, 315/75r16 (35") BFG Mud-Terrain KM2s on 16x8 Eagle Alloys, custom 2 1/4" exhaust with Magnaflow muffler

#568828 - 04/12/05 04:56 PM Re: Valve seal procedure - '95 Montero 3.5 DOHC [Re: ryany]  
scaesare  Offline
Wheeler
Joined: Feb 2005
Posts: 115
Ashburn, VA
OK, I've gotten back to needing to do this,and I'm getting ready to order parts. I'll be confirming part #'s for the seals, as there seems to be some contradictory info here...

Thanks ryany for that water pump part #.

A couple of more Q's-

1) I'll be checking mitsubishiparts.net. Any other good sources for parts?

2) I see that the online tool arehouse referneced above has another valve sprin compresoor that's designed for use with the heads on the block, but substianlly cheaper. Has anybody used this type? URL Here:

Compressor

3) How do did y'all fab up the adapter to keep the cylinders charged with compressed air? Did you ise one of these?

4) Finally, would anybody recommend using one of these:

Retainer Tool

Thanks guys.

Last edited by scaesare; 04/12/05 05:05 PM.

-Steve
-1995 Montero SR 3.5L V6 DOHC

#568829 - 04/13/05 08:10 AM Re: Valve seal procedure - '95 Montero 3.5 DOHC [Re: scaesare]  
Anonymous
Unregistered

Quote
4) Finally, would anybody recommend using one of these:

Retainer Tool


This will not be possible. The valve spring compressor slides over the valve stem, the same place this tool is used. This would work great for most Chevy/Ford V8's utilizing a c-clamp style valve spring compressor, but our engine is a real piece of engineering work. <img src="/forums/images/graemlins/barf.gif" alt="" />


#568830 - 04/13/05 02:25 PM Re: Valve seal procedure - '95 Montero 3.5 DOHC  
scaesare  Offline
Wheeler
Joined: Feb 2005
Posts: 115
Ashburn, VA
SRMan-

Thanks, I was rather wondering that myself.

In addition, here is an updated parts list for doing this job. A couple of updated part #'s, including one for the plenum gasket specified in "Tech Section" of the site here (any ideas on how we can update that?)



[EDITED TO REMOVE THIS LIST. INSTEAD I HAVE UPDATED THE ORIGINAL LIST ABOVE]

These parts were confirmed by the folks at mitsubisihiparts.com, as well as a local dealer parts dept.

Also, here's a link to an air fitting that should do the job for keeping the valves up:


Air Hold Fitting

Thanks again for everybody's input.

Last edited by scaesare; 05/12/05 01:53 PM.

-Steve
-1995 Montero SR 3.5L V6 DOHC

#568831 - 04/14/05 12:16 AM Re: Valve seal procedure - '95 Montero 3.5 DOHC [Re: scaesare]  
ryany  Offline
Body Damage is Cool
Joined: Feb 2005
Posts: 1,508
Phoenix, AZ
I found that I was able to use the hose from my compression tester, which has a quick disconnect on the gauge end. Just thread the hose into the plug hole like you're going to check the compression, and connect the other end to an air hose quick disconnect fitting, no adapter needed. My gauge is made by Actron, but I've seen other brands with this same design.


95 Montero SR 3.5
OME shocks & springs, cranked torsion bars, 2" body lift, 3" gas tank lift, 4.90 gears, Aussie front locker, factory rear locker, Aisin manual hubs, Roger Brown Rock Sliderz, 315/75r16 (35") BFG Mud-Terrain KM2s on 16x8 Eagle Alloys, custom 2 1/4" exhaust with Magnaflow muffler

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