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displaying posts 1 to 14 of 14
| Author | Subject: Main bearing / Big end bearing sizes |
 ravemercer
Regular  Location: kent Registered: 18 Jan 2009 Posts: 422 Status: Offline |
Post #1
Is there one usual size for the main bearings if the crank hasn't been ground and is in good condition ? Or is there any measurements available for the crank journals to confirm what size main bearings to use ? Getting 59.90mm / 59.91mm on the main journals and 49.91mm / 49.92mm Big end journals. Cheers |
 Posted 6th May 2013 at 20:25
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welshpug!
Capt Pedantic  Location: Bigend, Wales. Registered: 27 Mar 2007 Posts: 25,839 Status: Offline |
Post #2
there is a colour code for the main bearings, where you use the relevant bottom bearing size according to clearance required, top mains are all the same thickness, all std rod bearings are the same.you would find paint marks on the mains caps IIRC. ________________________________________ need a part number? get on here - http://public.servicebox.peugeot.comBring on the Trumpets. |
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Posted 6th May 2013 at 20:34
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ravemercer
Regular Location: kent Registered: 18 Jan 2009 Posts: 422 Status: Offline |
Post #3
Ok cheers will look for a paint mark didnt notice any when i was at it earlier i'll take a closer look.Was looking on service box and theres 6 diffrent sizes listed by colour for the mains. The haynes refers to a code on the block that tells you what mains to use but the is no code on the block where it should be i'm guessing it was a sticker that has perished and fallen off. So what your saying is there could/should be a diffent size lower main bearing to compensate for each journal diameter ? |
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Posted 6th May 2013 at 21:30
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welshpug!
Capt Pedantic Location: Bigend, Wales. Registered: 27 Mar 2007 Posts: 25,839 Status: Offline |
Post #4
yeah, IIRC the barcode is behind the lower engine mounting bracket.the VIN MAY narrow it down, I dont know if servicebox will have info that detailed. ________________________________________ need a part number? get on here - http://public.servicebox.peugeot.comBring on the Trumpets. |
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Posted 6th May 2013 at 21:53
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ravemercer
Regular Location: kent Registered: 18 Jan 2009 Posts: 422 Status: Offline |
Post #5
Ok ill have a look there. Haynes show its under the thermostat elbow but its not. |
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Posted 6th May 2013 at 22:16
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JWP EFi
Turbo Legend!  Location: edinburgh Registered: 07 Mar 2010 Posts: 2,163 Status: Offline |
Post #6
if your in any doubt then i would consider getting the crank ground then fit oversize set of shells at least that way you are guaranteed perfectly true journals |
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Posted 6th May 2013 at 23:12
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ravemercer
Regular Location: kent Registered: 18 Jan 2009 Posts: 422 Status: Offline |
Post #7
Yeah thats an option.The spare crank I've got looks to be in good condition came out of a working 6 so it would be a waste of money grinding it down if its in spec, was hoping someone had a true measurement for the journals. When people say under size could be -0.3 -0.5 oversized but oversized from what original bearing size as pug list 6 sizes and it looks like your supposed to mix and match bottom shells to compensate for tolerances as welsh says. Or am i thinking to deep into it and just need get a set of "standard" Acl bearings off Rich/Miles :donno |
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Posted 7th May 2013 at 06:57
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JWP EFi
Turbo Legend! Location: edinburgh Registered: 07 Mar 2010 Posts: 2,163 Status: Offline |
Post #8
ACL's are way forward, used them a few times now |
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Posted 7th May 2013 at 10:45
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #9
I believe I have the ACL's in mine, as Rich built the current engine and the crank was only polished not ground as it did not need it.  ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone  |
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Posted 7th May 2013 at 12:08
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rich_w
Seasoned Pro  Location: Havant, Hampshire Registered: 29 Jul 2004 Posts: 5,412 Status: Offline |
Post #10
The mains and big-ends are all the same size on the RFS.What were you using to measure the crankshaft journals? ________________________________________ Contact Details:rich@lynxpowerengineering.co.uk 07732 822546 |
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Posted 7th May 2013 at 13:54
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ravemercer
Regular Location: kent Registered: 18 Jan 2009 Posts: 422 Status: Offline |
Post #11
I know its not the correct tool,was using digital vernier caliper. just to see if it's there or there abouts. Will pm you later rich there might be couple other bits I need if you've got them. |
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Posted 7th May 2013 at 20:15
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ravemercer
Regular Location: kent Registered: 18 Jan 2009 Posts: 422 Status: Offline |
Post #12
Will be going with the Acl's then seem like a win win on price and quality. Just out of interest if i was going to get a polish done on the journals just to be sure, whats a fair price and does anyone know someone decent in medway/maidsone/ashford ? Cheers |
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Posted 7th May 2013 at 21:51
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #13
I used to use Dartford Rebore for engine work when I lived in Kent.  They seemed ok and not too pricey. ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 9th May 2013 at 20:00
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ravemercer
Regular Location: kent Registered: 18 Jan 2009 Posts: 422 Status: Offline |
Post #14
Ok cheers if i decide to get the crank polished i'll look then up  |
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Posted 9th May 2013 at 20:28
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