Blown engine

[Scott 77]

Well guys u we’re right. I didn’t listen so I have paid the price & it gonna be a hefty one. Engine broke a ring today & ruined cylinder.
Is there someone here who will be willing to help me build this thing the right way. I know I got have cyl sleeved. Can I reuse the rods or do I buy new. Do I have new cylinder bored to match others & were do u recommend I buy parts. Thanks

 

[racerone]

Your location ?------Buying a rebuilt block is the " I want it done tomorrow " option.----Available on line.----What motor ?

 

[flyingscott]

Why do you think it needs to be sleeved?

 

[Scott 77]

I’m in Mt Sterling KY. I don’t have to have it tomorrow but I would like to fish some this season but it is what it is. It is a 1992 Johnson 200 V6 looper. VJ200SLENS. The dowel came out of a piston & scratched the cylinder almost all way thru sleeve. If someone has a good block I am interested. Thank y’all

 

[Scott 77]

Any idea as to why one of the ring dowels came out of the piston? I haven’t had a chance to take apart will start tonight. I’m having trouble finding a shop to work on it. Anyone from my area know of someone?

 

[racerone]

Shops often refuse to work on older motors.----Sometimes they run into issues halfway through the job such as parts availability.------Or an irate / impatient customer.---Many shops have plenty of work on $50,000 toys and like to keep those customers who will be happy.------Just driven by common sense.

 

[Scott 77]

I found a reputable shop willing to do the work for $450 I furnish the sleeve. My question is can I reuse my piston rods? White can I reuse and White should I replace new. Thanks

 

[Scott 77]

Do I need to take the crank to the machine shop and have it checked it looks good to me but that’s not saying much.

 

[Scott 77]

Is a weisco sleeve ok

 

[Scott 77]

I found a 1990 Evinrude 200. They are saying it has 90 psi on all cylinders it’s from Stroud marine 750$ + freight. It looks just like mine will all my parts bolt on??
E200TXESM.

 

[Scott 77]

Can someone tell me if these two engines are compatible I’ll see from the diagrams that the Evinrude has a little different carburetor then the Johnson will my carburetors work will everything off my engine go right onto this one stater power pack etc.

 

[Tassie 1]

I dunno if they are compatible,
but buying a block with ordinary compression figures seems like a jumping out of the pan into the fire scenario,

 

[Scott 77]

That’s why i’m asking because I don’t know correct me if I’m wrong but I thought these engines were designed to run on lower compression 100 psi. I will probably just stick with my rebuild plan.
can someone please tell me if it’s OK to reuse my piston rods.

 

[iggyw1]

I found a reputable shop willing to do the work for $450 I furnish the sleeve. My question is can I reuse my piston rods? White can I reuse and White should I replace new. Thanks

If it is a reputable shop that is willing to do the sleeve, take the rod to them so they can check it out & they should be able to determine if it can be used again or not I would think, and they should be able to tell you what else you can reuse and what you cannot.

 

[havoc_squad]

That’s why i’m asking because I don’t know correct me if I’m wrong but I thought these engines were designed to run on lower compression 100 psi. I will probably just stick with my rebuild plan.
can someone please tell me if it’s OK to reuse my piston rods.

To answer your question specifically:

You have to inspect for signs of heat discoloration, uneven wear, or pitting on either crank journal, connecting rod crank bearings and connecting rod bearing holding surface.

Regarding the connecting rods themselves, keep an eye out for connecting rod caps being warped (those often show up when they are removed and you attempt to put them back on, where they won't align). When that happens, you're probably better off buying a good used connecting rod.

The biggest issue/problem at hand that should be considered:

You need to train yourself to know how to inspect the engine mechanic parts and check tolerances with the proper equipment. You've already got burned once, it's time to slow down and put the brain to work.

In a sense, you are going to have to put yourself through a self-taught marine outboard technician training course if you're going to do most of the powerhead rebuild/assemble work. There's no shortcuts.

Some of this you can do yourself, however a lot of it you will need to source out.

This is not like reading the directions on installing a TV mount and LCD TV on the wall.

You must do a lot of research, think analytically, and be willing to ask well thought out questions.

Right now your options are:

1. Send powerhead to be rebuilt by a professional who will always itemize list what was replaced/serviced and why.

2. If they are within local driving distance, send the powerhead to the professional and have them service/replace items that require machine shop work. That way you can pick up the parts and do the assembly yourself if you do it correctly.

3. Buy a remanufactured powerhead from one of the suppliers.

Any way you do the rebuild, you will have to research and determine what jet changes in the carbs will need to be made for an oversized motor.

 

[Scott 77]

Thank you. Most definitely will slow down. Doing all the research I can now. I really can’t afford to let a shop do the build so I hope between what I can read common sense & asking you guys it can get done properly. Thanks

 

[emoney]

90-100 lbs is normal compression for this motor, ftr. And I'm pretty sure the 1990 Johnson and 1992 Evinrude were the same exact motor. You'd want to confirm that information, probably by reaching out to your local 'Rude professional, but I don't think they changed a whole lot until after the middle/late 90's when they went to Ficht.

 

[havoc_squad]

If the piston ring stop pin got knocked out/pushed out and not an issue of gross sloppy cylinder to piston wall clearance, then from my limited knowledge I would likely guess two key possibilities:

1. Ring end gap was too tight. This could put excessive pressure on the rings and stop pin.

2. Whoever rebuilt the motor beforehand possibly did not properly chamfer the ports, this has also been known to put excessive pressure on the piston ring stop pin.

I now remember asking several months ago that a local machine shop builder who long ago did two stroke motors but does not now, he said if the machine shop work done in boring or sleaving it to spec and the ports were properly chamfered, further chamfering would not be needed if the only thing needed was deglazing the cylinders.



So in short, if boring the cylinder (new or old) is done, the ports must be chamfered correctly or after an incident like yours, all the ports need to checked and chamfered if needed by a professional after the machine shop bores/resleaves the bore.

Take that advice as second hand info with a grain of salt.

 

[Faztbullet]

Any idea as to why one of the ring dowels came out of the piston?

This is a common problem with the looper motors as no one changes impeller every 2 years..it called piston pin migration . Its mainly on the 93 and up closed deck blocks. If your is a 1992 it should be a open deck and these cylinders wear in a taper. Is this the motor you just refreshed?

 

[Scott 77]

Yes it is. Can u explain to me what a open or closed deck block is. I should have taken advice here & had it checked not really knowing any better I thought it would be ok. Well it wasn’t :frusty: