Mi16 Big End Bearings

[kaich 6 1 Cars]

I'm planning to rebuild my xu9j4 engine

I've read several threads about including the rebuild of Kyepan

http://forum.205gtidrivers.com/index.php?showtopic=105821&page=1

I've checked the journals with a micrometer and I got a set of Peugeot bearings(code. 0606 h1)

With plastigauge I've found (all in the four journals) 0,045-0,055 mm

Haynes says 0,025 -0,050 mm

according this thread:

http://forum.205gtidrivers.com/index.php?showtopic=107417&

 

with RFX (2.0 8V?) bearings I can achieve the right clearance.

does anybody confirm that?

 

any advice would be very apreciate

 

 

[welshpug 1,657]

depends how thick 0606 H1 are, but if the crank is otherwise in good condition and the bearings are the correct dimensions I can't see why not.

[petert 586]

0.025mm is way too tight and just asking for trouble. That's just 1 thou. The range you have is perfectly acceptable for a 50mm journal.

[kyepan 291]

check the rebuild manual for the xu9j4, that gives the factory tolerances for the crank and bearing shells, it's available online.

 

http://docs8.chomikuj.pl/181502932,PL,0,0,XU9J4-Rebuild-Manual.pdf

here

 

also, i went through the same thing as you.

 

 

Max clearance should be 0.01 inch per inch diameter.
50mm in inches = 1.96850394
60mm in inches = 2.36220472

1.96850394 * 0.01 = 0.00196 inches clearance = 0.049784 mm maximum clearance for a 50mm journal


2.36220472 * 0.01 = 0.00236 inches clearance = 0.059994 mm maximum clearance for a 60mm journal.

So my reading is less far off it then says + 0.005inches for race / higher viscosity oil = 0.073mm

 

 

I went into one on this, and checked each bearing shell and journal and tried to even up the clearances across the crank.

 

 

That was definitely worth it.. mic-ing up the crank on each journal, initially i was getting 60 plus mm, then if i kept fiddling, it started dropping to 59.99 or 98, and the odd 97. I took an average across each journal. Then setting the micrometer to 60.00 allowed and zeroing the bore gauge, allowed me to take a measurement of each journal at vertical, right 30 deg, and left 30 deg. Results are interesting.

5 journal size 59.98 average
5 vertical ID 60.04 = 0.06 mm clearance.
5 right ID 60.048 = 0.068
5 left ID 60.06 = 0.08

4 journal size 59.99 average
4 vertical ID 60.04 = 0.05 mm clearance
4 right ID 60.04 = 0.05
4 left ID 60.06 = 0.07

3 journal size 59.99 average
3 vertical ID 60.034 = 0.046 mm clearance
3 right ID 60.033 = 0.044
3 left ID 60.055 = 0.56

Struggled to get a good reading on 2 and 1 as the bore gauge was fouling on other objects, perhaps i need to remove block from stand and access from other direction.

2 journal size 59.99
2 vertical ID 60.045 = 0.055 mm clearance
2 right ID 60.04 = 0.06
2 left ID 60.35 = 0.065

Ran out of time to take off stand mount and do bearing 1.

May try swapping 5 and three bearing shells to see if i can even it up a little. But that is a lot more like it, Also noted the part numbers of the original shells are marked up differently to mine.

​

Edited February 28, 2013 by kyepan

[kaich 6 1 Cars]

thanks for the replies

 

 

0606H1 are 1,83(3?) mm measured with my scrappy gauge

 

according the rebuild manual (thank kyepan!) standard big eng bearing should be 1,828 mm + 0,15

kyepan, your main journals are perfect I guess! talking about big end journals, so if you consider a race engine the clearance rise up to 0,073mm..

btw with rfx bearings (1,843mm) I got:

(1,843 x 2 )- (1,833 x 2 )= about 0,002 mm less clearance

I've measured each journals at 0°- 90° -180° - 270 with plastigauge

worst value is 0,060 (journal 2) --> 0,040 mm with rfx bearing

better value is 0,032(journals 3) --> stay with 0606h1

is it correct?

 

ps: petertt, thanks for the advice, taylor eng is it your site?