Rhino dead

I can bet there was galling of the wristpin, VERY common on 660 motors. Or it dropped a valve, and the piston hit the valve and exploded.

I'm with Dave. That started at the bottom of the crank. Nothing to do with the wrist-pin. The wrist-pins still intact. Wrist-pin galling will result in Wrist-pin failure. The bottom rod-bearing went. The main clue is the cracked-sleeve at the bottom. The toasted-bearing let the rod swing-out and smack the sleeve, which fractured it. That motor's done man. Even with a case-down rebuild and all bearings. It will never be the same.

Here's something for you I found on a different site.

I have a stock 660 rhino engine for sale that was tuned by Weller racing and comes with K&N intake, CVT filter, KMS clutch sleeve, oil siphon break, CDI and Pro Armor Exhaust with billet tip.

Engine has 167 hrs on it and runs great. I am selling this to do an R1 swap.

Make offer?

If interested please email: matt@sinistersports.com

From what I have seen a dropped valve would still be open if it took a hit and of course bent. But anythings possible.

MuddyBuddy wrote:

what caused the bearing to fail? How can I prevent it from happening again or is it just one of those things?

Muddy, how many miles on it and was the carb jetted or stock. Also what was your intake and exhaust? Stock or Mod.

From Rhino Forums:

"Top end rod failures can be traced to lean conditions or low oil level 90% of the time. Get that piston scorching hot for long periods of time and the top pin will seize. Run it low on oil and it will seize. The rhino motor is a low pressure high volume oil system. I'm not a fan of scavenging oil from the main crank passsage to spray out on the rod. The big end rod bearing sprays plenty of oil to lubricate the pin.

Use good oil ( i prefer mobil-1 harley oil 20-50). Check the level every time you ride it. If it's too much of a pain in the ass to pull the engine cover, get yourself one of those dipstick extensions. And most important to me is make sure your jetting is correct. Honestly the best way I have found to do this is with an air fuel meter. "

Good post Marty.........when I first saw the pic's of the carnage, I thought that the piston looked melted, but said nothing being that I'm not qualified to air up a tire.

But, it had surely gotten hot.....seized in the cylinder causing the jug to be expanded and cracked...causing the sudden stopping of the engine. Have had this happen to me 2 times with the Cummins.......1 time it came loose and only had piston and sleeve damage... the 2nd time the piston seized it came loose....then seized again. When this happened the rod pulled the wrist pin boss out of the bottom of the piston.....long story short.....10" hole in the oil pan and a 10" hole in the right side of the block.

i still say it lost fire

He was Doing donuts when it blew, maybe it was low on oil.

Foxfire wrote:

but said nothing being that I'm not qualified to air up a tire.

Damn Fox your lucky. I cant even check the air pressure.

The Oil level was fine. Due to a fan failure at brimstone one time it did overheat pretty bad but that was several months ago and still ran fine after that. Yank, every performance mod you can have on a rhino without touching the motor I have so yes to the exhaust and the jet kit which could of very well been the culprit. Me and Carbs never got along so my buddy at the dealership jetted it for me but after that it ran great but would still die sometimes if it sat idle for a while.
rodie im gonna check into that motor tomorrow as well just for the heck of it.
Smith sorry i missed your call buddy ive been on the road livin in a tour bus for 3 days been a lil hectic ill give ya a shout tomorrow!!
UPDATE: Talked to skin he sold the built motor but still has a stock one that im leanin towards. The only question is am i gonna get his guy to build it or do it myself. His guy is charging 400 plus parts..... the other motor I have already excepted is a total loss so ive given up on it and it will be getting ripped out soon. The cases are the only thing good left on it. The rzr is still in the back of my mind but i think the rhino has a few years left in it!! Atleast rebuild her for a ride or 2 and actually sell it for a lil bit of money

i sold my 04 rhino back in the fall for $4800. so 3000 not all that bad without a motor.

Bush your an evil man lol. and the fact that was a starting offer before i actually brought it too him and he saw all the goodies on it.. either way i was talking to my brother and one of the factors also was im a big man, and in the rzr my left leg would be constantly at a bent angle where as the rhino i can atleast have a lil room. Either way talked to skin and the motors mine the only decision now is whose gonna build it because what fun is just dropping in a stock motor if your gonna go through the trouble of swapping one out? Im home for a lil bit tonight then hittin the road again tomorrow morning. IF work stays this good i might be able to roll like some of you big dogs and keep the rhino for reserve and have my rzr both!!! Ill get on in the mornin corey give me a call ill be on a tour bus most of the day we will catch up

MuddyBuddy wrote:

..........either way i was talking to my brother and one of the factors also was im a big man, and in the rzr my left leg would be constantly at a bent angle where as the rhino i can atleast have a lil room..........

Matt, Bush would not understand about being a big man. He is a little guy and fits in a RZR with ease.....

Dump the past and run to the future, RZR

im 6'3'' 290 i fit in the rzr better than i did the rhino. on the rhino my knee was in the dash all the time.

but if you can have both go for it. i keep the rhino 2 years after i got a rzr but i never rode it. my dad rode it some but there was no need for me to have both because the rhino was just not the same riding in the woods after riding the rzr.

Matt, Just get what YOU like, not what anyone else likes, its your machine, not theirs.

smith700 wrote:

Matt, Just get what YOU like, not what anyone else likes, its your machine, not theirs.

Nobody cares what he buys, he's the one that brought up buying a rzr.
We all know you would have one if you could talk paw paw into it

Gun, I will admit, the RZR is somewhat of a nice trail machine, but for anything else, it's not any use. It has basically no bed space at all, everything to work on is just all cramped tightly together, you are cramped up in the cab, you cannot tow anything with it at all, do to the 1 1/4" receiver, the underside of the dash is exposed, which showes lots of wires...it needs a finished look, it took them 3 years just to put a glove box on it from factory, you get covered with mud, without adding mudflaps in every corner, it eats bushings...why, I dont know. the bed does not tilt, it does not even have a factory front bumper, you could poke a hole in the gastank with a stick if you wanted to, the air filtration system should not need a outerwear added to it....they don't even have a parking brake from factory, the ECU is under the seat????, the "awesome" Fox(chino) 2.0's are junk......the list goes on and on.
I quit thinking about one when Dan off of Windrock board had the trans replaced twice in about a month, he has invested over 20K in it...mostly on replacement parts. He rides every weekend, his last ATV, a 06 Honda Rincon had 14,000 miles on it.....he rides his stuff.

Smith I use my RZR to work with just as much as my Rhino.
I had to work on my Rhino twice as much as my RZR. You can tow with RZR as with a Rhino. It gets real old to have to listen someone mouth about a machine the they have never owned.
As far as having problems with a machine they all have problems.

How many cords of wood do you plan to haul in the bed, due to the rear baja-bars.
How many good size trailers are around that use a 1 1/4 ball??
Try loading a small load of gravel, dirt, or rocks in a RZR bed.....good luck.
No, I do not own a RZR, but our next-door neighbor has one (09 RZR-S), and we ride on 73 acres of woods behind my house, and helped him maintain it many times, and I have rode with him many times.
I am only stating facts........

Dont ya just love a debate If i needed a farm vehicle i would have bought a ranger, lots more power and hauls way more than the rhino, So you needed all those mods to haul wood? I got central heat, so i dont need wood. I bought mine to have fun, and a rhino cant hold a candle to a rzr in that category.
And no mater what you do to yours it will never even come close to hanging with a stock rzr, thats just the facts too.

Debate is good on forums...

I could care less about who I can keep up with, because I am always leading the rides........

You are forgetting the problems I have found with a RzR.

The underside of the dash is exposed, which showes lots of wires...it needs a finished look, it took them 3 years just to put a glove box on it from factory, you get covered with mud, without adding mudflaps in every corner, it eats bushings...why, I dont know. , it does not even have a factory front bumper to protect the radiator, you could poke a hole in the gastank with a stick if you wanted to, the air filtration system should not need a outerwear added to it....they don't even have a parking brake from factory, the ECU is under the seat-give me a break????, the "awesome" Fox(chino) 2.0's are junk......the list goes on and on.
What is your answer to these problems.

I have owned both

I would never give my Rzr up for any Rhino, I got tired of replacing axles. My best friend got tired of it too, bought Summers Bros. 300m axles....broke them as well.

The "awsome" Fox shocks you speak of are worlds ahead of the "Sport" shocks my Rhino came with.

The 700 Rhinos intake tube runs under the floorboards.....if you poke a hole in it how will you ever know? Well, I guess your engine locking up will be a good sign.

The Rzr radiator may be unprocted, but I have still yet to see one become clogged up from mud.....Ive seen enough Rhinos with clogged Rads. that I would have to take off my shoes to count.

The underside of the Rzr dash is exposed...inside the "cab" Far better than the Rhino which runs its wiring in the outside of the cab, where more water, mud, sticks can get to it than the Rzr will will ever allow.

I can change my Rzr belt in 14 mins, (I timed it) How long does it take you to change yours?

The Rhino seats might as well be made of wood

I may poke a hole in my Rzr gas tank, but its better than the thin layer of plastic for a floorboard protecting me from the sticks that can (and will) come through the rhinos floorboards, as it pretty much doubles as a skid plate under the riders.

The 700 may be better, but my 660's air filter was kinda a guessing game (I guess the airfilter stayed in place while I snapped the lid on)

ECU under the seat? Id say its no different than being in a box thats in the direct path of mud and water spray from the front tire.

You trust your Rhino parking brake on the side of a mountain? You got alot more faith in it than I ever had if you do!

Hows that for a debate? Any Teryx guys wanna chime in also? I got a list I can make on those too!!

You couldnt give me a rzr.

smith700 wrote:

Debate is good on forums...

I could care less about who I can keep up with, because I am always leading the rides........

You are forgetting the problems I have found with a RzR.

The underside of the dash is exposed, which showes lots of wires...it needs a finished look, it took them 3 years just to put a glove box on it from factory, you get covered with mud, without adding mudflaps in every corner, it eats bushings...why, I dont know. , it does not even have a factory front bumper to protect the radiator, you could poke a hole in the gastank with a stick if you wanted to, the air filtration system should not need a outerwear added to it....they don't even have a parking brake from factory, the ECU is under the seat-give me a break????, the "awesome" Fox(chino) 2.0's are junk......the list goes on and on.
What is your answer to these problems.

OK, lets address your concerns;

Dash, i have no wires hanging down.
glove box, Didnt need it then, dont now.
never had a busted radiator nor has it ever run hot, unlike many rhinos i have ridden with.
poke a hole in the gastank, i have rode with hundreds of rzrs and never seen any with a busted tank, from stick or rock.
prefilter just saves changing the filter as often.
I have a parking brake, and it works 10 times better than the mickey mouse on on rhinos. I paid 99.00 it works, yours included doesnt.
ECU is not under the seat its behind it.
fox shocks work 100 times better than anything yamaha has ever offered
Bearings and other items wear out in anything thats run thru mud and water, no matter who makes it.

I wont go into whats wrong with a rhino,dont really care, dont own one and never will, but to be so great funny you now see 20 times as many rzrs in the woods these days.

Keep telling yourself how big a pos they are, cause pawpaw aint going to buy you one anyway, kinda like a christmas story...

NO! you would shoot your eye out
Maybe if you ask for a XP, he will let you turbo the whino