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 Re: My Pajero 3.0 V6 rebuild - with pics
[Re: Kevin C]
#945061
08/04/09 10:28 PM
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Joined: Feb 2004
Posts: 10,238
Web Wheeler
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Kevin, I'm not certain. It's been a while since I looked at a 3.0L crankshaft, but if my memory is correct, it appeared machined. I don't have one handy to check, though.
Frank
'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum
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Re: My Pajero 3.0 V6 rebuild - with pics
[Re: FrankR]
#945062
08/05/09 12:51 AM
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Joined: Feb 2004
Posts: 10,238
Web Wheeler
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I can never remember how to do a screen capture and put it in a web page, so I'll type it: No: TSB-91-11-001
Date: February, 1991
Model: 1988-1990 V-6 Montero, Sigma
PURPOSE
V-6 engines manufactured since 1988 incorporate an improved crankshaft design. This design change consists of an undercut fillet at the ends of the crankshaft journals, which increases the strength of the rod and main bearing journals, thereby increasing the durability of the crankshaft. Crankshaft machining is not recommended for these crankshafts since any grinding will alter the internal radius and reduce the strength of the crankshaft.
Since crankshaft machining is no longer possible, references made in the affected service manuals must be deleted.
INSTRUCTIONS
Please delete or change text in the affected service manuals as shown on pages 2-7 of this bulletin, and, as reference to this TSB, please write this TSB number in the TSB Revision boxes on the affected service manual pages.
NOTE: In the 1989 and 1990 Montero Service Manuals the "Taper of journal and pin" specification has been revised from 0.05mm (.002in.) to 0.03mm (.0012 in.)
They sound fairly certain of themselves with that, so I'll be interested to hear what others have found. Frank
'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum
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Re: My Pajero 3.0 V6 rebuild - with pics
[Re: FrankR]
#945063
08/05/09 02:41 AM
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Joined: Jan 2000
Posts: 16,227
Web Wheeler
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I can never remember how to do a screen capture and put it in a web page, so I'll type it: Frank if it's simply text you're trying to incorporate into a post, it's usually a lot easier to simply copy and paste the text directly into your post, using 'quote's as needed. Otherwise, if you're using a Windows PC & it's an image (or a window of text for that matter) then follow this process... 1) With the window of text on screen, hit your [alt] + [prt scrn] keys together. This captures an image of what's on your screen. 2) Paste that image into an image file (via ms paint or some other image editor). 3) Save this image file as a jpg or gif (jpg is smaller). 4) Upload and save this image online. 5) Link to it using the Image link in the Instant UBB Code section when you enter a new post or manually type in the img codes when you enter your post. HTH but don't hesitate to ask for clarification if I just confused you further. <img src="/forums/images/graemlins/lol.gif" alt="" />
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Re: My Pajero 3.0 V6 rebuild - with pics
[Re: off-roader]
#945064
08/05/09 06:32 AM
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Joined: May 2009
Posts: 435
OP
Mudrunner
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RE: cut crank.
AFAIK He is only going as deep as the score mark so they call it more of a polish than anything else. I'm new at this so excuse the possible silly question......how deep you reckon is dangerous?
NB: Due to time difference I will probably only have spoken to the machinist about 5 hours from time of this post.
 Karma's Law - For every action there is a multiplied reaction! 93 Pajero GLS 3.0 V6 LWB - SOLD 2001 Gen3 Di-D LWB - SOLD 2005 Touareg R5 2.5 TDi
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Re: My Pajero 3.0 V6 rebuild - with pics
[Re: off-roader]
#945065
08/05/09 11:38 AM
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Joined: Feb 2004
Posts: 10,238
Web Wheeler
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Thanks, Ray - it was the second explanation that I can never remember - probably because I don't often have a need for MS Paint.
Polishing the crankshaft journals is fine. I've done that many times. It doesn't remove much material at all.... maybe .001-.0015".
Since you said he was going to use undersize bearings for the "cut crank", we assumed grinding instead of polishing - 2 completely different operations. You will use standard size bearings after a journal polish. I would not suggest grinding as much as 0.010" for resized bearings and even for polishing, I would be mindful of the limit callout for OE bearing clearance, which is .004".
Since OE standard clearance is .001-.002", the machinist can't polish off more than .001-.002" before the crankshaft is ruined because of too much bearing clearance.
Frank
'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum
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Re: My Pajero 3.0 V6 rebuild - with pics
[Re: FrankR]
#945066
08/05/09 12:00 PM
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Joined: May 2009
Posts: 435
OP
Mudrunner
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Thanks for the heads up guys. Just spoke to the machinist and he says he needs to take 0.010 off. <img src="/forums/images/graemlins/scared.gif" alt="" /> He says he has never had a crank come back broken/damaged ( due to his work )out of over 20 he has done - he says he has taken up to 0.025 off on previous cranks. <img src="/forums/images/graemlins/zombie.gif" alt="" /> Maybe our cranks are different here <img src="/forums/images/graemlins/confused.gif" alt="" /> Should I shop for a new/refurbished crank? your input in this is greatly appreciated? <img src="/forums/images/graemlins/kewl.gif" alt="" />
Karma's Law - For every action there is a multiplied reaction! 93 Pajero GLS 3.0 V6 LWB - SOLD 2001 Gen3 Di-D LWB - SOLD 2005 Touareg R5 2.5 TDi
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Re: My Pajero 3.0 V6 rebuild - with pics
[Re: 4ePikanini]
#945067
08/05/09 04:33 PM
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Joined: Feb 2004
Posts: 10,238
Web Wheeler
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Maybe our cranks are different here
Yes, I've heard that they're smaller. <img src="/forums/images/graemlins/ignore.gif" alt="" /> <img src="/forums/images/graemlins/lol.gif" alt="" /> Seriously, if he wants to stand behind it, I'd let him try.... but I'd make sure he will R&R + rebuild the engine all at no cost to you for a reasonable warranty time - say 6 months minimum. Otherwise, I'd look for another crankshaft. Now - just to make sure - he's talking about 0.010 inches - not 0.010mm, right? If he's talking inches, you're now out on a limb with a decision to make - one that I can't advise because I have not heard of any anecdotal evidence that the crankshafts can be cut with good results. Nor have I heard or seen proof that they will break after grinding. I suspect that Mitsubishi was being cautious with this TSB and perhaps if you don't abuse the engine, you can get away with grinding it 0.010"..... but it's your money and your choice. My tendency would be to trust my machinist if he stands behind his work. You might be able to find a better crankshaft at a wrecker that would only need a polish. Frank
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Re: My Pajero 3.0 V6 rebuild - with pics
[Re: 4ePikanini]
#945068
08/05/09 04:41 PM
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Joined: Feb 2007
Posts: 1,167
Body Damage is Cool
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the quote is in ![[Linked Image]](http://img10.imageshack.us/img10/4264/machining.jpg) ![[Linked Image]](http://img193.imageshack.us/img193/6031/partss.jpg) quite reasonable actually....
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Re: My Pajero 3.0 V6 rebuild - with pics
[Re: FrankR]
#945069
08/05/09 08:24 PM
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Joined: May 2009
Posts: 435
OP
Mudrunner
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Maybe our cranks are different here
Yes, I've heard that they're smaller. <img src="/forums/images/graemlins/ignore.gif" alt="" /> <img src="/forums/images/graemlins/lol.gif" alt="" /> Seriously, if he wants to stand behind it, I'd let him try.... but I'd make sure he will R&R + rebuild the engine all at no cost to you for a reasonable warranty time - say 6 months minimum. Otherwise, I'd look for another crankshaft. Now - just to make sure - he's talking about 0.010 inches - not 0.010mm, right? If he's talking inches, you're now out on a limb with a decision to make - one that I can't advise because I have not heard of any anecdotal evidence that the crankshafts can be cut with good results. Nor have I heard or seen proof that they will break after grinding. I suspect that Mitsubishi was being cautious with this TSB and perhaps if you don't abuse the engine, you can get away with grinding it 0.010"..... but it's your money and your choice. My tendency would be to trust my machinist if he stands behind his work. You might be able to find a better crankshaft at a wrecker that would only need a polish. Frank afaik cranks are pretty rare and expensive here. sometimes being more expensive than a refurbished engine. <img src="/forums/images/graemlins/confused.gif" alt="" /> The machinist was quite surprised at the TSB as he says he has done many cranks like this one before ( in worse condition ) with no problems at all. He has a good reputation in the area ( hence my long wait ) and has been around for many years. I think I will trust him on this as he said the crank can be cut. I have told him to do what he thinks needs done and also instructed him to source the parts ( i don't want any fingers pointing at me ) for the build as I expect ( and will get ) a warranty. Thanks for all the help so far and will keep you guys updated. Hoping to go there monday and take some progress pictures NB: I have until monday to source a used crank so if i find one at a steal i'll just get it at the wrecker.
Karma's Law - For every action there is a multiplied reaction! 93 Pajero GLS 3.0 V6 LWB - SOLD 2001 Gen3 Di-D LWB - SOLD 2005 Touareg R5 2.5 TDi
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Re: My Pajero 3.0 V6 rebuild - with pics
[Re: 4ePikanini]
#945070
08/09/09 08:22 AM
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Joined: May 2009
Posts: 435
OP
Mudrunner
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I have ordered some parts from the dealer as the machinist says I can have the motor month-end. All new coolant hoses except the connections that go to the back heater matrix ( never gets below 10 celsius here ) Two new tensioner pulleys ( expensive and the quote says they are power steering pump pulleys ??? - I sent a pic to the dealer to make sure they are correct) Two new engine mountings TO bearing ![[Linked Image]](http://img38.imageshack.us/img38/5223/firewallpipes0781720.jpg) ![[Linked Image]](http://img44.imageshack.us/img44/9152/inletmanifoldplenumpipe.jpg) ![[Linked Image]](http://img169.imageshack.us/img169/9278/pullies2153196.jpg) ![[Linked Image]](http://img41.imageshack.us/img41/8917/ronniesorder.jpg)
Karma's Law - For every action there is a multiplied reaction! 93 Pajero GLS 3.0 V6 LWB - SOLD 2001 Gen3 Di-D LWB - SOLD 2005 Touareg R5 2.5 TDi
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