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old Murray/Briggs push mower #4721683
04/09/18 01:44 PM
04/09/18 01:44 PM
Joined: Feb 2011
Posts: 1,302
Golden Meadow, LA
mobilaltima Offline OP
mobilaltima  Offline OP

Joined: Feb 2011
Posts: 1,302
Golden Meadow, LA
I was cleaning out the shed by my grandmaws recently an decided to get the old Briggs push mower running that has been sitting for about 10 years, its around 15 years old. Its a flathead 3.5 or 4 hp, I drained the old gas, put a new diaphragm on the carb (carb mounts to tank) new air filter as the old one was dry rotted and a new spark plug and she runs like a champ. I do have a few questions. I drained the old oil and filled it with some Rotella 15W40, it holds half a quart, would it be safer to go with some SAE 30 due to concerns of viscosity breakdown or will the 15W40 suffice? Also, its a throttle free design, pull the lever and start it but If I tie a rope on the handle for it to stay running I can go by the throttle lever and rev it up by hand. Am I missing a spring that allows it to stay at a constant speed? Would Champion RJ19LM be the right spark plug? Thanks for any info. My grandmaw is glad that its running again. I offered to cut her grass but she refuses as she wants to do it, at 76 years old if that makes her happy I'm not arguing with her.


2006 2500 Dodge 5.9 Cummins Mobil Delvac 15W40, Fleetguard Stratapore 90k miles
Early '99 F250 ECLB 7.3 Stroker, 223k miles
Re: old Murray/Briggs push mower [Re: mobilaltima] #4721689
04/09/18 01:52 PM
04/09/18 01:52 PM
Joined: Feb 2011
Posts: 912
MA
AandPDan Offline
AandPDan  Offline

Joined: Feb 2011
Posts: 912
MA
It was spec'd for SAE30 so you can use that oil - no problem.

The handle you are tying down is likely for the blade brake, a safety device. Many mowers do not have a throttle control and run at constant speed. Does it try to hold rpm on it's own? You are overriding the governor when you move the throttle lever. It should go back to "normal" when you let the throttle lever go.

The RJ19LM should be correct. If you can post the engine model info we can be certain.

Re: old Murray/Briggs push mower [Re: mobilaltima] #4721690
04/09/18 01:53 PM
04/09/18 01:53 PM
Joined: Sep 2015
Posts: 1,692
USA
mk378 Offline
mk378  Offline

Joined: Sep 2015
Posts: 1,692
USA
It's a preset governor. There should be a spring pulling the throttle plate wide open when it is stopped. When the engine revs up to about 3000 rpm, the governor lever or air vane will pull the throttle plate closed.

There's no interaction between the user control and the governor. Releasing the deadman lever stops the engine by cutting the ignition and engaging a flywheel brake.

If the governor spring is missing, it will run but it will bog down and stall when trying to cut even a small amount of grass.

Last edited by mk378; 04/09/18 01:53 PM.
Re: old Murray/Briggs push mower [Re: mobilaltima] #4721708
04/09/18 02:09 PM
04/09/18 02:09 PM
Joined: Apr 2016
Posts: 1,202
Campbellsville, KY
Alex_V Offline
Alex_V  Offline

Joined: Apr 2016
Posts: 1,202
Campbellsville, KY
SAE 30 may be best for it but I wouldn't worry about draining the 15w40 before running it a few hours - at least use it as an engine flush. I've messed with countless of those engines and never seen one that showed detectable internal wear. I think you could run it at 100% load with 0w20 and it would still last hundreds of hours.


To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: old Murray/Briggs push mower [Re: mobilaltima] #4721880
04/09/18 04:30 PM
04/09/18 04:30 PM
Joined: Jan 2018
Posts: 897
San Antonio, TX
das_peikko Offline
das_peikko  Offline

Joined: Jan 2018
Posts: 897
San Antonio, TX
Originally Posted By: mobilaltima
Am I missing a spring that allows it to stay at a constant speed?


We won't know unless you post up the engine numbers. Use 30 weight oil.

Re: old Murray/Briggs push mower [Re: mobilaltima] #4722215
04/09/18 09:50 PM
04/09/18 09:50 PM
Joined: Dec 2016
Posts: 8,011
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 8,011
Waco, TX
I have been running whatever inexpensive 15W-40 oil is available in all of my OPE for nearly 30 years with no ill effects.

SAE 30 is fantastic oil,..... but the engine will last the same amount of life on 15W-40, also


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: old Murray/Briggs push mower [Re: mobilaltima] #4722352
04/10/18 04:08 AM
04/10/18 04:08 AM
Joined: Jan 2011
Posts: 2,938
N.Ohio
Lubener Offline
Lubener  Offline

Joined: Jan 2011
Posts: 2,938
N.Ohio
Hard to hurt those old Briggs, practically any oil will do in that. I have used J19LM, J8, CJ8 or H10 plugs in those, whatever I had.. They all work well.

Last edited by Lubener; 04/10/18 04:08 AM.

The "thinking" man's friend.
Re: old Murray/Briggs push mower [Re: mobilaltima] #4722370
04/10/18 05:08 AM
04/10/18 05:08 AM
Joined: Feb 2011
Posts: 1,302
Golden Meadow, LA
mobilaltima Offline OP
mobilaltima  Offline OP

Joined: Feb 2011
Posts: 1,302
Golden Meadow, LA
I drained the Rotella yesterday and used some Havoline straight 30. As far as engine numbers, the model is 10H902, the type is 0522 E1, and the code is 05031454. Its a 4.5 SQ


2006 2500 Dodge 5.9 Cummins Mobil Delvac 15W40, Fleetguard Stratapore 90k miles
Early '99 F250 ECLB 7.3 Stroker, 223k miles
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