990 block to chassis oring size

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jazo
Posts: 772
Joined: Fri Jun 15, 2007 7:13 am
Location: New Zealand

990 block to chassis oring size

Post by jazo » Mon Jan 21, 2019 8:52 pm

Hi, I have a imp 990 I'm repairing for a costumer and I have a new bottom gasket set but the 2 half orings that seal around the main bearing housings appear to be to thin. They measure 4mm which I think they should be 3/16 or something imperial. Anyone know the correct size? Thanks Jason
1394 4wd
1294 4wd
30D
990x2
880
780x2
900

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GeoffDEAL
Posts: 411
Joined: Tue Jan 27, 2009 8:25 am
Location: New Zealand

Re: 990 block to chassis oring size

Post by GeoffDEAL » Tue Jan 22, 2019 1:55 am

Hi jazo had a look in a original parts book but it only shows the front seal and doesnt indicate size, i guess front and back are the same, how do they compare with the bits that came out they would be a bit flattened but may give an indication of original size. never had a later than Cropmaster block out myself, perhaps check another type of gasket set to compare. cheers Geoff

jazo
Posts: 772
Joined: Fri Jun 15, 2007 7:13 am
Location: New Zealand

Re: 990 block to chassis oring size

Post by jazo » Tue Jan 22, 2019 3:57 am

Hi Geoff. It was a sparex kit. The supplied orings don't protrude at all! Yes front and rear are the same size
1394 4wd
1294 4wd
30D
990x2
880
780x2
900

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cobbadog
Posts: 573
Joined: Tue Oct 11, 2011 6:18 am
Location: beautiful Coopernook NSW. near Taree. NSW. Australia

Re: 990 block to chassis oring size

Post by cobbadog » Tue Jan 22, 2019 5:10 am

Contact david brown spares and ask them the correct size. 4mm is a bit bigger than 3/16" isn't it? That would make them seal well or be a fair mongrel to slip in.

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ollek
Posts: 3773
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: 990 block to chassis oring size

Post by ollek » Tue Jan 22, 2019 8:03 am

1/16 of a inch is 1,587 mm. 3/16 of an inch is therefor 3x1,587=4,761 mm. For quick calculations you can use the following easy to remember figures: 1/16 of an inch equals 1,6 mm.

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GeoffDEAL
Posts: 411
Joined: Tue Jan 27, 2009 8:25 am
Location: New Zealand

Re: 990 block to chassis oring size

Post by GeoffDEAL » Tue Jan 22, 2019 8:21 pm

Hi jazo if you feel that you need thicker 0 ring section it is available in bulk in different sizes from good engineering supplies for making up large o rings for jobs like large pumps ect, they just cut off what you need. I got some from Front Store down here for a large pump to suit in that case the ends are glued together with a special Loctite glue.

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ollek
Posts: 3773
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: 990 block to chassis oring size

Post by ollek » Wed Jan 23, 2019 7:00 am

I would recommend to contact david brown spares as suggested. Just fitting a "bigger" O-ring without knowing the correct diameter, can result in leaks and other problems.

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