Rebuilt ONAN B48 20HP engine remanufactured core required

See notes below!

This is a brand new rebuild, not a brand new engine!

A properly re manufactured engine is as good or better than a new one as ( seasoned ) blocks have less chance of warpage or change as you use them than a new one.

You can't get this quality of work at a local mower shop or dealer as it requires an engine rebuild/machine shop with proper equipment and know how. This is not just a bored out engine with the valves ground but a fully remanufactured block and most of the work done is listed below.

Because we have been getting so many bad cores in it has been impossible to hold the price on engine or cores. All core charges have been raised to $400 up front unless you want to send us your ( good ) core to avoid paying core up front. We can tell you how to inspect your core before sending if you think its good !We have a general block pictured below and not tWe have a general block pictured below and not the exact one you will get as there are many blocks and configurations available in each brand and application. For this reason we will need to ask you a number of questions to make sure we send you a block that is a drop in fit. We have blocks available for most any application to rebuild but it's best to call before buying just to make sure we have in stock.

Call (330) 868-7875 or (330) 956-6830 from 9 to 5 eastern time first to make sure we do have a core for your application. For instance we have a number of blocks for a John Deere but they have many variations and are not easily interchangable at so you need to get the proper block.

Current wait time to ship a block from time of order is 4 weeks and this can vary so you can ask that also when you call.

( 2 ways to buy ) 1st you can send us your core up front and avoid a core charge ( we will immediately send you a special shipping box with packing instructions ) and you send us your core within 1 week. ( For this option you should be fairly sure it is rebuildable ( we will let you know if it isn't and show you why with pics ) as if it's not you would still owe some of the core charge.  2nd pay core charge up front, we rebuild and send our block and send to you, you install new block, put your core in our box and call us and we pick it up. Then we determine core refund when it comes back and (most) receive full refund if engine was running  and seats aren't loose or out and even if blown when block oil crossover is not severly damaged bottom of cylinder broken , but read our note about cores at bottom of ad.

If you send your core to us up front make sure to tell us if you want the exact one back as many times we have a similar engine already 1/2 way done before it gets here and we may ship it back to keep on our time schedule. We sometimes have 30 or more on order at any 1 time and to get out in a timely manor we ship out the quickest way we can unless you specifically specify you want yours back!!!

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All blocks are degreased, acid dipped, blasted, and then hot pressure tank washed several times to remove carbon, dirt, rust, and grease for a clean surface to work on.

Critical gasket surfaces are machined flat for a good seal.

Blocks are bored  for a like new fit of pistons and rings and new pistons and rings installed.!. (Just honing a used bore as many shops do will increase piston to wall clearance and will not correct cylinder out of roundness so just honing and re ringing will not seal as well or last nearly as long as boring and installing new pistons and rings with proper clearance)

Valves, guides, and valve seats are all re machined to like new or better specs for a good seal! (just lapping valves and seats will not correct seat and guide or seat and valve misalignment so will last a lot shorter time than re machining)

Camshaft governor assembly is totally reconditioned as many come in broken or ready to break and new cam bearings installed.

Crankshafts are all remachined to factory new specs and a new rods installed

Camshaft and lifters are reconditioned!

Engine is assembled with new pistons, rings, rods, bearings, gaskets , and seals and other reusable parts inspected and replaced as needed!

Engine is coated with heatproof primer and ready for paint

Next we set points on B Series and then set valve clearance

Balance of gaskets are sent with block so you can reassemble oil pan, intake and exhaust manifolds, and oil filter unit ( IF EQUIPPED ) 

Balance of gaskets are sent with block so you can reassemble head, oil pan, and other items.

 We are also now sending some assembly tips as we are finding some people getting engine assembled incorrectly!

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(CORES) 6 years ago 4 out of 5 cores returned were not blown up and rebuildable, so we weren't so picky on cores. Now 4 out of 5 are returned to us blown  and many greatly damaged as people are waiting longer to fix their problem. Also a greater number are coming back all ready rebuilt or worn to the limit and the cost to resleeve a block or weld a crank back to standard is about 3 times the cost to remachine and rebuild. Our prices are low and are based on having a good rebuildable core returned and that is why we charge a core charge. We pretty much have a set refund rate if items are damaged, a block that needs sleeved or is broken or oil crossover tube is damaged beyond repair is MINUS $95, a crank worn out of machining specs is minus $75. If one seat in block is loose or out and repairable MINUS $50 but if more than 1 is bad block is considered non repairable and is MINUS $95. Our core charge is very reasonable and even if we give nothing back and get a junk block it still costs us much more to replace than we are charging you.

We have had to go to this because we are getting some unbelievable cores back- we've had cranks worn to .050, we had 2 running engines with cylinders worn to almost .060 (must have used a quart of oil an hour), some with blocks cracked in half, 1 had chunks broken out of top of block as they tried to remove broken studs, and many others. We are fair and use a simple rule of thumb, ( If you can take your engine to a shop and they can remachine and rebuild for you to use, you will get your core charge back. Most shops if you take to them and they have to get you a new block or crank you will likely pay $200 to $400 more to them to get you correct usable parts so we are very fair. To avoid any hard feelings we are now inspecting return cores much better and then taking pictures of damaged blocks if customer didn't realize.  Most people tell us on phone anymore if they have damage so we are having fewer people get a surprise when they don't get full core refund but we always give customer as much back as we possibly can. And a note that (MOST) running cores sent back receive about 100% core refunds and even about 60% of blown engines do also.

Also note that if you buy a 20 HP we must have a like core returned. You can't take your 16 Hp to a shop and have them rebuild it to a 20 Hp and we can't either.

CHECK OUT THE MANY OTHER ITEMS WE HAVE FOR SALE IN OUR STORE BY CLICKING ON THE TAB AT TOP RIGHT OF THIS PAGE ( VISIT SELLERS STORE )

IF YOU NEED HELP OR NEED TO SPEAK TO SOMEONE CALL 330 956-6830 or 330 868-7875 FROM 8 TO 4  EASTERN TIME MONDAY THRU FRIDAY! CLOSED SATURDAY AND SUNDAY