Oil for SU carbs; reminder - Page 2

Groundes-Peace · Jun 2nd, 2015, 14:32

Thanks for all the feedback.
My small can of 3in1 oil sitting on my garage shelf seems to be working well.

bayliss Thomas · Oct 16th, 2016, 23:16

Do not know what oil is in my carb's but I believe they need topping up. Decided to use ATF, should I drain out the remaining old oil before using ATF and if so how? Thanks for advise/comments.

CLIVERALLY · Oct 17th, 2016, 08:00

Personally I would not bother but if you want to do it get a syringe from the vets and put a bit of small tube on the end of it

Ron Kwas · Oct 17th, 2016, 10:13

Forum; ATF works just fine for me, but in a pinch, I find Marvel Mystery is also acceptable because of the similar viscosity.

bT; To remove/replace unknown existing Damping Oil, remove Air Filters and Damping Valve Assemblies (not absolutely necessary, but it gives better access for disassembly and cleaning), remove Domes (lift away along axis), then lift away Dashpot (carefully, also along axis, so as not to damage Metering Needles), and pour old damping oil from reservoir onto a clean, white paper towel to allow inspection of color and viscosity. During disassembly, do not mix components of the two, without good reason.

While apart, and you are familiarizing yourself with your (wonderful) SUs, and before reassembly, a general cleaning, inspection, and lubing is a very good idea. See: http://www.sw-em.com/SU%20Carb%20Service.htm Reassembly is as they say, the reverse of disassembly.

Good Hunting!

JDmac · Oct 17th, 2016, 12:28

Hi all, back in the day(when ah wor a laad) it was always 3 in 1 for SU dashpots. Fill so that when inserting the valve there should be about 1/4" gap from top of dashpot to bottom of thread when the valve is just touching the top of the oil.
Those new fangled Strombergs hadn't arrived on the scene yet,cheers,JDmac.

jimbo1593 · Oct 18th, 2016, 15:01

This is one of those age old questions for anyone with an SU or similar.
SU state SAE20 - which I use.
I also have some SAE30, if I'm not happy with 20, but that's only cos it's dead cheap form Toolstation.

volvo21 · Oct 18th, 2016, 21:19

I use ATF in my stromberg and it gets sucked out so I just tap it up. Should I use a thicker oil?
Also I was told the oil should lubricate the carb but judging by your replies it´s not it´s function.

classicswede · Oct 19th, 2016, 00:06

Quote:

Originally Posted by jimbo1593

This is one of those age old questions for anyone with an SU or similar.
SU state SAE20 - which I use.
I also have some SAE30, if I'm not happy with 20, but that's only cos it's dead cheap form Toolstation.

Exactly - the oil for SU's is one of the few things Volvo got wrong

classicswede · Oct 19th, 2016, 00:06

Quote:

Originally Posted by volvo21

I use ATF in my stromberg and it gets sucked out so I just tap it up. Should I use a thicker oil?
Also I was told the oil should lubricate the carb but judging by your replies it´s not it´s function.

It is time for a new diaphram in the carb most likely

volvo21 · Oct 19th, 2016, 11:08

Quote:

Originally Posted by classicswede

It is time for a new diaphram in the carb most likely

it´s practically new, under 10k km on it, changed it late last year..

Oct 17th, 2016, 08:00	#13
CLIVERALLY Master Member Last Online: Apr 18th, 2024 23:55 Join Date: May 2010 Location: wetherby	Personally I would not bother but if you want to do it get a syringe from the vets and put a bit of small tube on the end of it __________________ Clive "Lets turn up the juice and see what shakes loose" Last edited by CLIVERALLY; Oct 17th, 2016 at 08:00. Reason: spelling error

Jun 2nd, 2015, 14:32	#11
Groundes-Peace Master Member Last Online: Mar 14th, 2024 17:23 Join Date: Jun 2009 Location: Milton Keynes	Thanks for all the feedback. My small can of 3in1 oil sitting on my garage shelf seems to be working well.

Oct 16th, 2016, 23:16	#12
bayliss Thomas Member Last Online: Aug 12th, 2020 14:11 Join Date: Sep 2016 Location: Bury st Edmunds	Do not know what oil is in my carb's but I believe they need topping up. Decided to use ATF, should I drain out the remaining old oil before using ATF and if so how? Thanks for advise/comments.

Oct 17th, 2016, 10:13	#14
Ron Kwas Premier Member Last Online: Today 02:54 Join Date: Jul 2007 Location: Connecticut, USA	Forum; ATF works just fine for me, but in a pinch, I find Marvel Mystery is also acceptable because of the similar viscosity. bT; To remove/replace unknown existing Damping Oil, remove Air Filters and Damping Valve Assemblies (not absolutely necessary, but it gives better access for disassembly and cleaning), remove Domes (lift away along axis), then lift away Dashpot (carefully, also along axis, so as not to damage Metering Needles), and pour old damping oil from reservoir onto a clean, white paper towel to allow inspection of color and viscosity. During disassembly, do not mix components of the two, without good reason. While apart, and you are familiarizing yourself with your (wonderful) SUs, and before reassembly, a general cleaning, inspection, and lubing is a very good idea. See: http://www.sw-em.com/SU%20Carb%20Service.htm Reassembly is as they say, the reverse of disassembly. Good Hunting!

Oct 17th, 2016, 12:28	#15
JDmac JD Last Online: Nov 25th, 2020 12:59 Join Date: Mar 2015 Location: Kilsyth	Hi all, back in the day(when ah wor a laad) it was always 3 in 1 for SU dashpots. Fill so that when inserting the valve there should be about 1/4" gap from top of dashpot to bottom of thread when the valve is just touching the top of the oil. Those new fangled Strombergs hadn't arrived on the scene yet,cheers,JDmac.

Oct 18th, 2016, 15:01	#16
jimbo1593 Master Member Last Online: Oct 1st, 2023 14:39 Join Date: Dec 2004 Location: leics	This is one of those age old questions for anyone with an SU or similar. SU state SAE20 - which I use. I also have some SAE30, if I'm not happy with 20, but that's only cos it's dead cheap form Toolstation.

Oct 18th, 2016, 21:19	#17
volvo21 Junior Member Last Online: Nov 28th, 2016 21:55 Join Date: Jun 2011 Location: Reykjavík	I use ATF in my stromberg and it gets sucked out so I just tap it up. Should I use a thicker oil? Also I was told the oil should lubricate the carb but judging by your replies it´s not it´s function.

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