Waukesha Gu Engine restoration

I am restoring a Waukesha GU engine and need some help to find parts or a salvage yard. This engine was used in a Sterling truck it looks like. I am looking for a flywheel, the flywheel housing, a magneto, a carburetor, the breather cap, the top water pipe just for starters. I know once I get in to the engine I will need internal parts as well. Can anyone help me with sources?

the first two pictures are of my engine. The third picture is one a WEHS.

Any suggestions will help.

I'm assuming that since you have a pic from WEHS you're corresponding with them re:
Overhaul/operating manuals...
The original carb, mag, flywheel etc on your engine when it left the factory...
Any other of the same that may've been installed on other GUs that would be likely to work on yours...
Any of the GU parts you need that may've been used on other Wauks, hopefully more popular ones (as WEHS is all volunteer, I don't know if they have an engine cross-index of parts, so the above may be presumptuous)...
A 38 Victor gasket catalog shows the GU by itself (not part of a "series' or 'family" of similar engines) which doesn't sound helpful, BUT they did carry a full range of gaskets, listing installations in KW, Oneida and Ward LaF as well as Sterling...
I would guess that size engine would be mostly used in heavy const, mining, dredging etc, which gives you more fields to search for parts---wehs can advise on this point as well.
WEHS's production figure page lists a "G" , but not the GU; your GU may be a variant of that "G", but none of my parts co catalogs I've indexed list the "G", just the GU...
Do not confuse with later engines designated G155, Gi67D and G176, which appear to be 35/8 bore...
I'll check some of my older catalogs for the G-GU and advise later.
With sympathy, Bud
Checked my catalogs re' innards (pistons/valves/brgs)...you lucked out: 4 catalogs agree you share brgs with the ER and EU, the EU being a much more popular truck engine...
Valves you share with a batch of 4s and a couple later 6s; can advise if WEHS has no list..
Pistons no help, GU all by itself---there is at least one more 53/8, the much 145GZ/GZB/GZU/F817G series, which is 53/8x6 vs your 53/8x61/4. You should check the above with WEHS, as my old catalogs are 30-99 yrs old now, and you might as well check to see if the later pistons possibly compatible...I have no specs to compare, and you're in no position to overlook grasping at ANY straws!!)...

Bud,

thanks, WEHS said this is one of 400 engines built for sterling. I, like you think there are probably interchangeable parts, but since this is my first Waukesha I'm not sure who would have parts or what salvage yards may be able to help. I do have the manuals from WEHS and they are greatly helpful. I haven't been able to determine the correct mag yet but still looking.

Bud, The GU was in the same series as the DU & EU. the copy of literature I have from WEHS has all three in one brochure from 26, the DU as the 41/2 x 6 1/4 the EU as 5 x 6 1/4 and the GU as 5 3/8 x 6 1/4. The valves are listed as the same diameter, in fact, the literature makes it sound like the EU and GU may use many of the same parts, and the EU and GU use the same parts diagram in the lit. the series was in use prior to 24.

Mags and Carbs will be dependent on how original you want to be, but to give you an idea of options for that era, Rock Island used a DU and EU engine (I would like to find an EU engine myself, I did find a GU on a dragline a while back, but we didn't buy it. we probably should have tried). I do not not know what carb for sure the EU used, but the DU on our Heider used a stromburg M3. A GU would need at least a Stromburg M4 if not an M5. mags for both of these tractors would have been a Dixie 46 with impulse. If you have not been in contact with WEHS, I can send you the brochure they sent me.

Good luck, these are not common engines, and the EU is in demand engine, so you will probably have better luck finding extra actual GU parts.

This is our DU.

(Sigh)---here I was thinking that since the EU was in a whole raft of trucks, parts'd be easier to find; but, as you said, the other side of the coin is more people looking for them, too...
As to profe$$ional obsolete parts dealers, I haven't kept my list up tp date, but check the "Vendors & Restoratiion Services" section on justoldtrucks.com (engines are quite aways down on the page) for a good start, and try Arrow Engines if not on the list (they cont'd some old Wauks and had a parts inventory awhile back)...
Pauls mention of the dragline is probably where most of these went; post on HCEA (Hist Const Eqpmt Assoc---it's a surprisingly small forum but they have an extensive library that might help), the Cat sites (Cat people spent their lives around heavy eqpmt) and mining sites (stripmine?) etc...
Unfortunately, one of the listings in my catalogs is Ward LaFrance 7B/7D 51/2-7T models 1927-30; the Fire Truck people are highly dedicated, so your'e competing with some of them...there are fire eqpmt sites, and probably a WLaF club, but they'd probably be more interested in getting yours than sharing any parts, altho they may've developed workarounds for anything no longer findable...
There were at least two sites that had lists of heavy truck/eqpmt wrecking yards; haven't found them but will advise; I do see an old ref to heavytruckpart.net you might try...
All I found in my catalogs was: Kenworth "T" 10ton 29-30; an unidentified Linn (half-track?)1930; Oneida "E9" 5T 29-30, a number of Sterlings 71/2-25T (no typo) maybe 25-28 and a Will "FK" 1930-31, in addition to the WLaF models. That said, many of these parts co's just didn't list the low-prod specialty models in their catalogs, so there may've been many more.

These engines were very popular in many early tractor and trucks and as power units. So yes they are in high demand but since Waukeshea cut off all support some 60 years ago, parts are virtually non existant. Any and all repairs have to be made from scratch or sourced from generic supplies. There are some specialty shops and custom rebuilders that can get you back in shape but it gets pricey. Go thru the list of sponsors and talk to them and likely you will get somewhere.

Thanks for all the references, I'll get busy and see if I can find some parts.
the EU you have Paul looks a lot like the GU I have. I know the heads I have are marked with an S for sterling. But all the outside parts look alike.

I pulled this off a mine. the engine was probably last used in 45 or so. that's when the mine was last in full production. so the engine has been visited by many scavengers.

I think all of them with the original heads have that casting mark. Ricardo type high compression heads were also available for these engines. The ones used in the Sterling trucks will have Sterling cast into the top of the crankcase oil filler cap. Possibly yours was on a Ingersol Rand air compressor unit. Several early tractors used these engines. Might contact some of the collectors that are into these early teens tractors, many of them have been at it long enough to maybe have saved a few spares from before the latest scrap drives took what was left.

Never did turn up those wrecking yard sites, but any HD wrecking yard there'll be on a computer network now, like the network on heavytruckparts etc...unfortunately, with the former spikes in scrap prices, lots of old stuff with little demand's gone to the furnaces...
In addition to those obsolete parts dealers on justoldtrucks there's:
enginemasters.com (obsolete, ind'l, oddball engine parts)
foleyengines.com
industrialenginerebuilders.com (parts for antq farm tractor engines/ign)
kanter.com website says cars, but they've been mentioned in truck/tractor forums
kraftpower.com (Wauk dealer0
millsmotorparts.com
oldtimepartsinc.com
Tom Underwood-Parts Of The Past, Lawrence, KS; no website, phone 785-749-5231 (Don't confuse with another Parts Of The Past in the East that has a website)
georgemillermachine.com--George bought an old dealers inventory several years back