Rhino engine carnage - Ouch!

7202 Views 19 Replies 10 Participants Last post by BiggJim, Jun 23, 2008

s2k1

Discussion Starter · Jun 20, 2008

4

Just pulled this one apart today. Stone stock, no mods other than 4 seat cage.
This is caused by lack of lubrication to the piston pin. The pin usually galls in the rod first. After the pin locks up in the rod, the only place it can pivot is in the piston. The piston doesn't like the extra abuse and in this case it disentigrated!

This is evidence that the stock rod is a pretty decent part. The rod gets a lot of bad mouthing over at RF but it really isn't the culprit usually. This rod is bent and twisted and it stayed in one piece.

The fix for this is two-fold.
1. Check the oil every day! Check it more often if you put a lot of miles on it!
2. Upgrade to a DLC psiton pin. DLC is "diamond like coating". It reduces friction substantially and basically prolongs the pin life even when there is a lubrication problem.

I put the DLC pin in all the engines I build. Money well spent.

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1 - 20 of 20 Posts

dieselpowered

· #2 · Jun 20, 2008

Ouch, ya that looks like it has seen better days!

Makes me want to go out right now and check the oil level.

mosslager

· #3 · Jun 20, 2008

Thats ruff... and spendy. Whats a repair like that cost?

s2k1

Discussion Starter · #4 · Jun 20, 2008

mosslager said:
Thats ruff... and spendy. Whats a repair like that cost?

Probably in the upper end of $3000 - $4000 range.

mosslager

· #5 · Jun 20, 2008

I think I would seriously look at a R1 swap if I knew I was looking at a repair like that.

Mush

· #6 · Jun 20, 2008

i have an engine for sale it will be pulled soon if your intrested, we could make a deal.

Goodtimes

· #7 · Jun 20, 2008

Great stuff Chris , Thanks for sharin!!! , Im still savin my money to come see ya !

goodguys75

· #8 · Jun 20, 2008

how many hours or miles on the motor????

k:

Mush

· #9 · Jun 20, 2008

around 80-90 not sure of exact # i just took it out 2 weeks ago and not sure how many hrs i put on it in that trip. I will check when i get home an post it with some pics maybe

BiggJim

· #10 · Jun 20, 2008

4

Nice but you didnt da as good a job as me:good::good:

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stetler

· #11 · Jun 23, 2008

That sucks. Your really better off buying a used one. Then you can sell off all the good parts from you blown up one.
The only problem is your still going to be stuck with the same insides as the one you just blew up and that's the reason it blew up.

dhc-6

· #12 · Jun 23, 2008

Are the insides of the 660 and the 700 almost the same? I have a 700 with 1200 miles on it and it seems to be running great.

Trooper522

· #13 · Jun 23, 2008

What is the cost of replacing the pin with the upgraded one you are talking about ?

BiggJim

· #14 · Jun 23, 2008

The pin is about 90 bucks. It is coated so that the surface will not gall up. I'm sure Chris can better explain. I also highly reccomend a CP piston. :good:
I have the coated pin in mine. I give a report of my findings next tear down

Trooper522

· #15 · Jun 23, 2008

90 bucks ? is this a do it yourselfer ? how hard is it to install ? how much would it cost to have it done professionally ?

BiggJim

· #16 · Jun 23, 2008

Its your piston wristpin. Its a do it yourself if you can change out your top end.:good:

Trooper522

· #17 · Jun 23, 2008

Cool ! now that I think of it I have had my top end redone on my quad before, I keep forgetting this is a quad engine we are dealing with :laugh:

s2k1

Discussion Starter · #18 · Jun 23, 2008

Trooper522 said:
What is the cost of replacing the pin with the upgraded one you are talking about ?

The DLC pin (diamond like coating) is $88.50. The pin BiggJim has is for a CP piston. The stock pin is much longer than the pin used for CP pistons.
I have not checked to see if they make one for the stock piston. If they don't, you can have the stock Yamaha pin coated. I don't know the cost for that.
I don't know what everyone else charges to do a Rhino top-end but through Benchmark it runs on average of $450 labor. A CP piston is $225 regardless of bore or compression. Plus a few bucks for coolant and gaskets.

Trooper522

· #19 · Jun 23, 2008

Hmm, so for about 300 or so if you did it yourself. I have never changed out a piston would this require much more work and difficulty ?

BiggJim

· #20 · Jun 23, 2008

Trooper522 said:
Hmm, so for about 300 or so if you did it yourself. I have never changed out a piston would this require much more work and difficulty ?

If you have many hours on your rhino I would definatly change the piston....Mine went at 40 hours

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