Mivec Owners Group

It is currently 24 Apr 2018 00:15

All times are UTC + 12 hours [ DST ]




Post new topic Reply to topic  [ 10 posts ] 
Author Message
PostPosted: 17 Oct 2014 08:25 
Offline

Joined: 27 Feb 2014 10:05
Posts: 38
Country: England
Hi going to replace the shells while i have the engine in bits.
Are they specific to a mivec or the same as a 1600 4g92 SOHC?
Thanks


Top
 Profile  
 
PostPosted: 17 Oct 2014 08:54 
Offline

Joined: 28 Jun 2008 21:00
Posts: 120
Location: Invercargill
Country: New Zealand
they are the same as 4g93t gsr but can't confirm the sohc sorry, i'd presume they wouldn't be any different


Top
 Profile  
 
PostPosted: 17 Oct 2014 09:34 
Offline

Joined: 27 Feb 2014 10:05
Posts: 38
Country: England
Thanks for the reply.
Was wondering if they were the same as a proton satria gti(4g93 Dohc) so i can get hold of them easilly being in the uk.


Top
 Profile  
 
PostPosted: 19 Oct 2014 06:21 
Offline

Joined: 27 Feb 2014 10:05
Posts: 38
Country: England
Been told today about coloured markings on the shells and mitsubishi should be able to supply them from whatever colour it is.
Mine have a green mark on them

Anyone know anything about this?


Top
 Profile  
 
PostPosted: 19 Oct 2014 09:49 
Offline

Joined: 28 Jun 2008 21:00
Posts: 120
Location: Invercargill
Country: New Zealand
When you buy an aftermarket bearing you get the nominal size which would be perfect if cranks and conrods were manufactured 100% accurately but they tend to vary ever so lightly. This is generally good enough and the norm when you do a rebuild but the OEM tend to go one step further and tailor the bearings to get the clearances 100%. So the colours and letters stand for slightly above or below nominal ie 45.00mm might be nominal but they want 45.01mm so they run an ever so thinner bearing to give that extra clearance.

If your engine has done 100,000+km then chances are the bearings with a green mark are no longer the ideal match for your engine.
Only way to find out is to measure everything before you buy the bearings or go for aftermarket bearings and live with the clearances


Top
 Profile  
 
PostPosted: 19 Oct 2014 10:24 
Offline

Joined: 27 Feb 2014 10:05
Posts: 38
Country: England
Thanks,the engine has done around 75,000km


Top
 Profile  
 
PostPosted: 19 Oct 2014 11:48 
Offline
Mivec Guru

Joined: 04 Jul 2005 13:25
Posts: 1207
Location: Lower Hutt
Country: NZ
The proper answer would be to take the bits to someone who can measure it properly, there's a certain spec for the sizes.
To answer your original question, the cranks are all the same so that means the bearings are too....apart from the tolerences and undersizes.
So......a 4G92 crank is a 4G92 crank......it doesn't know what engine it's in.
A 4G93 crank is a 4G93 crank.......again it doesn't know what engine it's in. The 2 different cranks use the same sized bearings. Just the stroke is diffferent.

Steve

_________________
6G72 mivec Twin TDO5 20Gs up and running.
Scrapheap special making exactly 280 horses at some unknown rpm.
Engine dyno under construction.

It's easier to fool someone than it is to convince someone that they've been fooled.


Top
 Profile  
 
PostPosted: 19 Oct 2014 22:47 
Offline

Joined: 27 Feb 2014 10:05
Posts: 38
Country: England
Thanks.

The bottom end is still in the car and i have removed the pistons/rods to replace the rings and shells.

What do you suggest is the best way of going about getting new shells?
Dont really want to take the crank out


Top
 Profile  
 
PostPosted: 20 Oct 2014 15:13 
Offline
Mivec Guru

Joined: 04 Jul 2005 13:25
Posts: 1207
Location: Lower Hutt
Country: NZ
It's a bit hard to measure the main bearings if you're not going to take out the crank?
You've really got 2 choices.
1 is to do it properly.
2 is to do it some other way.

There's a service manual online.
Reading that is always a good start?

You buy the bearings from the same place you get the other parts from.
From the parts shop.

Steve

_________________
6G72 mivec Twin TDO5 20Gs up and running.
Scrapheap special making exactly 280 horses at some unknown rpm.
Engine dyno under construction.

It's easier to fool someone than it is to convince someone that they've been fooled.


Top
 Profile  
 
PostPosted: 26 Oct 2014 08:51 
Offline

Joined: 27 Feb 2014 10:05
Posts: 38
Country: England
Engine is now out and im taking the crank out,thanks


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 10 posts ] 

All times are UTC + 12 hours [ DST ]


Who is online

Users browsing this forum: Baidu [Spider] and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group