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Joined: Mar 2022
Posts: 7
Ross22 Offline OP
Novice
I recently purchased an old Briggs & Stratton engine for my 21st Anniversary Greenfield ride-on.
The engine does not have an engine cover, so I don’t have the engine details to determine the correct engine cover.
I want to use a pull starter, so the opening in the engine cover needs to be concentric to the shaft.
The flywheel suggests the engine is a 25 series i.e. 10HP, 10.5HP, or 11HP.
I tried an engine cover off a 1986 11HP 253707 0160-02 (red), but it’s too small and won’t go over the perimeter fittings.
I tried the following engine covers, but they all needed front spacers, hit the air filter, and the shaft was 3-5mm off centre from the opening:
1993 10.5HP 28B707 0115-01 (black).
1999 11.5HP 28D707 1126-E1 (red).
1987 12HP 281707 0148-01 (red).
1993 12.5HP 286707 4030-01 (dark red).
1994 12.5HP 289707 0114-02 (dark red).
1993 14HP 287707 0153-01 (dark red).
Can anyone identify the engine from the photos, so I can buy an engine cover that will fit the engine?

Attached Images
IMG-2363.jpeg (264.51 KB, 121 downloads)
IMG-2366.jpeg (278.77 KB, 119 downloads)
IMG-2368.jpeg (287.83 KB, 115 downloads)
Engine.jpg (263.66 KB, 116 downloads)
Membership information
Joined: Jan 2016
Posts: 7,432
Likes: 136
SENIOR TECHNICIAN
Hi Ross22,
Do you have any history on the motor and what do you intend to do with the mower. If you want to use it as a mower I wouldn't waste any money on it much better to just buy a new motor. If you want to just restore it to something original then that is up to you

Joined: Mar 2022
Posts: 7
Ross22 Offline OP
Novice
Hi Norm
I have restored the mower to a reliable condition, and I will use it to cut my lawn. The only money I need to spend on the mower is the engine cover (upto $100). A new engine would be $1,500. The rest of the mower is ready to go. I have been reliably told that the engine was overhauled 5 years ago. The engine compression does feel good. I have electrically started the engine, and it ran well. But, I need the correct engine cover to restore pull starting. Does anyone recognise the motor?

Last edited by Ross22; 08/03/22 08:48 PM.
Joined: Sep 2015
Posts: 2,003
Likes: 138
SENIOR TECHNICIAN & HISTORIAN
G'day Ross22 and Norm

It looks like the only cover that hasn't been tried is an 8 Hp cover (that may explain the front spacers)

I think if it was me I'd try the 8 hp cover and if that is wrong I'd remove the head and measure the bore and stroke.

Another way may be to measure some distances so they can be checked on another motor.

Cheers
Max

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IMG-2366a.jpg (281.38 KB, 97 downloads)
Joined: Mar 2022
Posts: 7
Ross22 Offline OP
Novice
Thanks Max,
I have taken all these measurements, but, it is difficult to get others to carefully check these dimensions on their engine covers, before I visit them. It is interesting that the 11HP engine cover was TOO SMALL, but the 10.5HP engine cover was TOO BIG. You would expect it to be the other way round. So, it may have something to do with the engine age or type. I am honing in on the 25 series engines (10HP, 10.5HP, & 11HP) because they all use the same flywheel as my engine. The flywheel on the 12HP engine is very different. I will have a look at smaller engines as well.
Thanks, Ross.

Joined: Sep 2015
Posts: 2,003
Likes: 138
SENIOR TECHNICIAN & HISTORIAN
I have 8 ,11,12.5 and 13 here if you want to check measurements Ross.

Joined: Apr 2014
Posts: 219
Likes: 10
Apprentice level 3
I’m sorry to say but I don’t reckon that engine will do much work before giving up the ghost.

The only bit that looks as though it’s been rebuilt in the last decade is the exhaust deflector.

I’ve had a few Greenfields and they need a decent mill on them to be reliable. A good one will outperform most fancy zero turns. I’d be looking for at least a 12 horse engine, preferably more.

There are a few floating around because the mower frames on many of the imported ride-ons chuck it in on our rougher lawns well before a well-maintained engine.

Joined: Jan 2015
Posts: 1,233
Likes: 32
Junior Technician
Can you backtrack, and look up other part numbers on the engine to find out what engine it is. Then get the cover number that way.
speedy


........................Keep your blades sharp......................
Joined: Feb 2006
Posts: 4,670
Likes: 163
SENIOR TECHNICIAN
Who lost it in the first place? I'd imagine it's vital to cooling as well.


Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!
Joined: Jan 2016
Posts: 7,432
Likes: 136
SENIOR TECHNICIAN
Ross,
I have rebuilt a few Greenies over the time and you are obviously looking in the wrong places if you are seeing prices like $1500 and as for paying $100 for a fan shroud, now that is crazy stuff

Joined: Mar 2022
Posts: 7
Ross22 Offline OP
Novice
Hi Max,
Thanks for your offer. I will recheck my measurements and get back to you shortly.

Hi Ironbark,
Thanks for the suggestion of a second-hand 12HP engine. That was my backup plan.

Hi Speedy,
Thanks for your suggestion of using part numbers on my engine to identify the engine details. I had started doing that with the flywheel. I am confident that my engine is NOT a 12HP, because the flywheel is so different. When I cross-checked the flywheel part number with various engine models, I found that it was consistently used in the 25 series (10HP, 10.5HP, & 11HP). When I looked up the corresponding engine cover part numbers, there were about 5 to choose from. I will start looking up other part numbers on my engine as well.

I must be looking for an uncommon engine cover. Each engine cover I have tried consistently has the engine shaft off-centre, and towards the muffler. Therefore, I am looking for an engine cover whose opening is closer to the muffler. Has anybody come across such an engine cover?
Regards, Ross.

Joined: May 2010
Posts: 304
Likes: 22
Apprentice level 4
None of the modern ones will go close as the block is longer on the 28 series. Most 8hp and 11hp cowls are interchangeable between engines of the same hp of similar vintage. Can you give me a measurement from the center of the crank to the head?

Joined: Mar 2022
Posts: 7
Ross22 Offline OP
Novice
Hi Nath,
Thanks for your reply. I will send you the measurement you have suggested.
Regards, Ross.

Joined: Feb 2006
Posts: 4,670
Likes: 163
SENIOR TECHNICIAN
Hmm....sounds like this is a rare type of engine shroud somebody scabbed off this one.


Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!
Joined: Jan 2016
Posts: 7,432
Likes: 136
SENIOR TECHNICIAN
Hardly worth messing with a second hand motor, only downside with all these Chonda motors is they don't come with a fuel tank.
https://www.ebay.com.au/itm/152978590659?

Joined: Mar 2022
Posts: 7
Ross22 Offline OP
Novice
Hi everyone,

Distance from engine cover support at head, to flywheel, is 136mm.
Diameter of flywheel is 207mm.
Distance from engine cover support at head, to centre-line of shaft, is 240mm.
Distance from engine cover support near dipstick, to centre-line of shaft, is 129mm.
Distance from engine cover support near throttle plate, to centre-line of shaft, is 134mm.
Distance from the air filter lid to centre-line of shaft, is 137mm.
The head has “25” stamped into the bottom corner, nearest the fuel tank.
The flywheel is stamped with “82” and “OIM”.
The engine has “062” stamped on the top surface, between the flywheel and air filter.

I have estimated that the engine cover should measure 368mm, from the inside face of the straight end, to the inside face of the furthest point on the curved section.

Regards, Ross.

Last edited by Ross22; 11/03/22 04:28 PM.
Joined: May 2010
Posts: 304
Likes: 22
Apprentice level 4
Ok, Well it is definitely not 8hp, and is larger than the old 10hp I have here at work, So I would say it is an 11hp I/C from the 80's. I will check a couple of the ones I have at home after work

Joined: May 2010
Posts: 304
Likes: 22
Apprentice level 4
Ok, well after some measuring, 25 series are all the same, 10 or 11hp. Now 12hp 28 series is larger at the rear end, fits you're measurements, but is 10mm longer overall. It achieves this with the mounting points on the head being longer.
So what i am suspecting, which would fit with the cover being missing and having been rebuilt, is that someone has put together a bitsa, with a 25 series head on a 28 series block, probably for a good bore, then gone to fit the cowl, with it not fitting given up and sold it off.
I would be pulling the head and confirming the condition of the block, then if good then looking to source a complete wrecked 12hp and making it all correct.

Joined: Sep 2015
Posts: 2,003
Likes: 138
SENIOR TECHNICIAN & HISTORIAN
Hi all

I got the same measurements as nath ,the 11 hp was too small and the 12.5 hp was 10 mm too long ,I was thinking the same thing
that the head may have been swapped . I would have just used 10 mm spacers on the front 2 bolts or 10 mm alloy flat bar.

The head swap may have been to raise the comp ratio as the compression may have gone down from age ,unless
it was rebuilt and you can trust the seller.

Mowers can be found with good engines from $50 to around a $100 but as Norm said if you have to buy parts or
spend time fixing an engine it's more cost effective to buy a new motor.

Cheers
Max.

Attached Images
Joined: Mar 2022
Posts: 7
Ross22 Offline OP
Novice
Hi all,

Thank you for all your time, efforts, and suggestions. I really appreciate your help. I will follow-up what Nath and Max have suggested.

Thanks again, Ross.


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