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B20b

All the classics... pre-1975 Volvos.
1970145swagon
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Year and Model: 1970 145s
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1970145swagon

B20b

Post by 1970145swagon » Sat Mar 09, 2019 4:23 pm

Hi me and a friend of mine have a 145s with a b20b in it. It has been sitting for 20 years. The motor was rebuilt then it sat. We cranked it over and it dumped oil at the back of the engine. We thought it was a rear main seal but when we pull the flywheel off. There's a little hole in the back of the block of the engine. it's above the crank and to the right of it. that leaks all the way down the back of the engine. Does anyone know what that is and what I'm supposed to put in there to prevent it from leaking? Any help would be be appreciated.



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RickHaleParker
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Re: B20b

Post by RickHaleParker » Sat Mar 09, 2019 5:25 pm

It just missing a plug. You can download the Service Manual for the B20B here.
2019-03-09.png


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

1970145swagon
Posts: 5
Joined: Sat Mar 09, 2019 4:08 pm
Year and Model: 1970 145s
Location: VA
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1970145swagon

Re: B20b

Post by 1970145swagon » Sun Mar 10, 2019 7:49 am

RickHaleParker wrote:
Sat Mar 09, 2019 5:25 pm
It just missing a plug. You can download the Service Manual for the B20B here.

2019-03-09.png
so i can you put in any pug as long as it fits? any way thanks for answering.



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RickHaleParker
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Re: B20b

Post by RickHaleParker » Sun Mar 10, 2019 9:03 am

As long as it fits and clears the flywheel. Go for a length that does not extend above the top of the hole. You might want to match the material so that you don't get Galvanic corrosion between the plug and the block.

Does this look like the correct plug? Aftermarket - Oil Galley Plug - B18 B20


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

1970145swagon
Posts: 5
Joined: Sat Mar 09, 2019 4:08 pm
Year and Model: 1970 145s
Location: VA
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1970145swagon

Re: B20b

Post by 1970145swagon » Sun Mar 10, 2019 9:44 am

RickHaleParker wrote:
Sun Mar 10, 2019 9:03 am
As long as it fits and clears the flywheel. Go for a length that does not extend above the top of the hole. You might want to match the material so that you don't get Galvanic corrosion between the plug and the block.

Does this look like the correct plug? Aftermarket - Oil Galley Plug - B18 B20
looks good to me. thanks for all you help!



jimmy57
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Re: B20b

Post by jimmy57 » Sun Mar 10, 2019 4:09 pm

It has been a long time but I think that is a 1/4 NPT plug (tapered threads called National Pipe Thread). The thread diameter is way larger than the dimension in the thread name. The size is for ID of iron pipe so the 1/8NPT is about 7/16 inch, 1/4NPT is between 9/16 and 5/8 inch, 3/8 NPT is about 11/16 inch hole.



93Regina
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Re: B20b

Post by 93Regina » Tue Mar 12, 2019 11:40 am

RickHaleParker wrote:
Sat Mar 09, 2019 5:25 pm
Service Manual for the B20B
Your link is in-op, here's the index



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