Mvvs 58 crankshaft movment
#1
Junior Member
Thread Starter
Join Date: Oct 2006
Location: Rivadavia, ARGENTINA
Posts: 14
Likes: 0
Received 0 Likes
on
0 Posts
Mvvs 58 crankshaft movment
Hi I've found this movment my engine.
The crankshaft moves about 1mm. But the engine runs with no problems o loosing rmps.
I'll post some pics to see the problem.
Anyone can tell me what is this what I must do?
The crankshaft moves about 1mm. But the engine runs with no problems o loosing rmps.
I'll post some pics to see the problem.
Anyone can tell me what is this what I must do?
#2
Senior Member
RE: Mvvs 58
Leo,
The bearings in your engine must have a bit of clearance to run properly...
If these two photos show the Δ of the front-most and rear-most positions; it seems to be significantly less than 1 mm.
The radial play will be ~1/10 of the axial play and this amount is not noticeable, or is it?
The bearings in your engine must have a bit of clearance to run properly...
If these two photos show the Δ of the front-most and rear-most positions; it seems to be significantly less than 1 mm.
The radial play will be ~1/10 of the axial play and this amount is not noticeable, or is it?
#3
Junior Member
Thread Starter
Join Date: Oct 2006
Location: Rivadavia, ARGENTINA
Posts: 14
Likes: 0
Received 0 Likes
on
0 Posts
RE: Mvvs 58
Hi Darzeelon, I've just measured the movement, and it is 0.5mm I know it's hard to see in the pics because you have no scale to compare, but I've just did it.
It can easly be moved and mekes a noise when you do that.
It can easly be moved and mekes a noise when you do that.
#5
Senior Member
RE: Mvvs 58 crankshaft movment
Leo,
An axial movement of 0.5 mm suggests a radial play of about 0.05 mm.
This is about right for C3 rating of the bearings.
In this engine, the crankshaft is floating in both bearings; not set under some pre-load, as in some F1 racing engines (which reduces axial play to 0).
You did not say that your engine was suffering from any other noise/phenomenon, when it is running.
It seems your engine is OK.
An axial movement of 0.5 mm suggests a radial play of about 0.05 mm.
This is about right for C3 rating of the bearings.
In this engine, the crankshaft is floating in both bearings; not set under some pre-load, as in some F1 racing engines (which reduces axial play to 0).
You did not say that your engine was suffering from any other noise/phenomenon, when it is running.
It seems your engine is OK.
#6
Senior Member
Join Date: Jan 2002
Location: Arcen, , NETHERLANDS
Posts: 6,571
Likes: 0
Received 2 Likes
on
2 Posts
RE: Mvvs 58 crankshaft movment
MVVS defines the max axial play as 0.5mm, so it still is OK.
Taking out all play reduced power by 200 rpm in my test engine, so I restored it to original.
Taking out all play reduced power by 200 rpm in my test engine, so I restored it to original.
#8
Senior Member
RE: Mvvs 58 crankshaft movment
Leo,
The play is entirely in the bearings.
It is the front bearing which ultimately limits the amount of play, since it is physically smaller and has smaller diameter balls.
In the presence of sufficient lube (from the fuel, or in sealed bearings, from the grease), bearings have very little wear.
When fatigue sets in, when you become old (....), surface pitting will eventually take place on the races and on the balls, but it will clearly be audible.
If you check the 'play' in one-two seasons, there would probably be no noticeable difference.
If there is (i.e. play has grown), just replace the bearings with identical size ones.
The play is entirely in the bearings.
It is the front bearing which ultimately limits the amount of play, since it is physically smaller and has smaller diameter balls.
In the presence of sufficient lube (from the fuel, or in sealed bearings, from the grease), bearings have very little wear.
When fatigue sets in, when you become old (....), surface pitting will eventually take place on the races and on the balls, but it will clearly be audible.
If you check the 'play' in one-two seasons, there would probably be no noticeable difference.
If there is (i.e. play has grown), just replace the bearings with identical size ones.
#10
Senior Member
RE: Mvvs 58 crankshaft movment
ORIGINAL: pe reivers
Don't fix it if it ain't broke.
Don't fix it if it ain't broke.
But there is another person in these fora who says otherwise...
"If it ain't broke; fix it until it is..."
#12
Senior Member
Join Date: Oct 2005
Location: QC,
QC, CANADA
Posts: 179
Likes: 0
Received 0 Likes
on
0 Posts
RE: Mvvs 58 crankshaft movment
HI!!
AS I said I my previous post, "EVO58X2 OIL", I flew my plane a lot this past week with motul 800 rr at 40:1
Last week I noticed that I had an axial play about 0.5mm, but this weekend I noticed that the play is about 1mm
the engine run fine, but I'm nervous the fly my plane, I'm afraid that somthing will break in the motor, I don't understand why a bearing
can cause this play, I don't see the bearing moving when I move the shaft and when the motor was new, he doesn't had this play
Why the fault is only to the front bearing???
thank!!
AS I said I my previous post, "EVO58X2 OIL", I flew my plane a lot this past week with motul 800 rr at 40:1
Last week I noticed that I had an axial play about 0.5mm, but this weekend I noticed that the play is about 1mm
the engine run fine, but I'm nervous the fly my plane, I'm afraid that somthing will break in the motor, I don't understand why a bearing
can cause this play, I don't see the bearing moving when I move the shaft and when the motor was new, he doesn't had this play
Why the fault is only to the front bearing???
thank!!
#13
Senior Member
Join Date: Jan 2002
Location: Arcen, , NETHERLANDS
Posts: 6,571
Likes: 0
Received 2 Likes
on
2 Posts
RE: Mvvs 58 crankshaft movment
The front bearing is secured in the housing with lock tite. It may need a small shot if the same?
Hot engine running may cause the locktite to loose it's fastening properties, so please do check your cooling.
I know, you think the engine is cooled well, but is it?
Hot engine running may cause the locktite to loose it's fastening properties, so please do check your cooling.
I know, you think the engine is cooled well, but is it?
#14
Senior Member
Join Date: Oct 2005
Location: QC,
QC, CANADA
Posts: 179
Likes: 0
Received 0 Likes
on
0 Posts
RE: Mvvs 58 crankshaft movment
I read in your previous post that if the engine is not cooled well the front seal
will leak, but mine doesn't leak and the engine is in a warbird " F4UCorsair"
I flew the plane mostly at half trottle, anyway is it dangerous this movement??
I read on your forum that mvvs has change the front bearing due to constumer critics
is this the same problem with the evo???
thank!! your help is very appreciate!!!
will leak, but mine doesn't leak and the engine is in a warbird " F4UCorsair"
I flew the plane mostly at half trottle, anyway is it dangerous this movement??
I read on your forum that mvvs has change the front bearing due to constumer critics
is this the same problem with the evo???
thank!! your help is very appreciate!!!
#15
Senior Member
Join Date: Jan 2002
Location: Arcen, , NETHERLANDS
Posts: 6,571
Likes: 0
Received 2 Likes
on
2 Posts
RE: Mvvs 58 crankshaft movment
I have no data on the play and allowed play that the evolution engines should have.
I think you should contact Horizon if you need to be sure.
1mm is a sign that the bearing is loose in the housing, though the seal still can be good. MVVS does not recommend customers to work on the engine because of some critical torque features inside. New engines have sealed cylinder bolts, and tamper-free connecting rod nuts for just that purpose. Again, I do not know about Evolution, but sound reasoning tells me it would be the same.
I think you should contact Horizon if you need to be sure.
1mm is a sign that the bearing is loose in the housing, though the seal still can be good. MVVS does not recommend customers to work on the engine because of some critical torque features inside. New engines have sealed cylinder bolts, and tamper-free connecting rod nuts for just that purpose. Again, I do not know about Evolution, but sound reasoning tells me it would be the same.
#17
Senior Member
Join Date: Oct 2005
Location: QC,
QC, CANADA
Posts: 179
Likes: 0
Received 0 Likes
on
0 Posts
RE: Mvvs 58 crankshaft movment
Hi Pe!
I received my engine from Horizon
here what they have changed
Front bearing
Connecting Rod Washer
[link=http://www.horizonhobby.com/Products/Default.aspx?ProdID=EVO3001I1101]Prop Drive [/link]
I have'nt flew the plane yet, the winter is about to beging
I will post back next summer in 2009
bye!
I received my engine from Horizon
here what they have changed
Front bearing
Connecting Rod Washer
[link=http://www.horizonhobby.com/Products/Default.aspx?ProdID=EVO3001I1101]Prop Drive [/link]
I have'nt flew the plane yet, the winter is about to beging
I will post back next summer in 2009
bye!
#18
Senior Member
Join Date: Jan 2002
Location: Arcen, , NETHERLANDS
Posts: 6,571
Likes: 0
Received 2 Likes
on
2 Posts
RE: Mvvs 58 crankshaft movment
I don't see why they should replace the washers, unless they damaged them? The prop drive just pops off without damage and can be used again and again. The connecting rod washer is a different story. One small mistake, and it's gone. You need qualified personell to do that job right.
#19
Senior Member
Join Date: Oct 2005
Location: QC,
QC, CANADA
Posts: 179
Likes: 0
Received 0 Likes
on
0 Posts
RE: Mvvs 58 crankshaft movment
I've flew my plane a lot this summer (2009)
not sure if the problem is gone, it seem there a little tiny play on the crank shaft
for the rest the motor run very good
not sure if the problem is gone, it seem there a little tiny play on the crank shaft
for the rest the motor run very good
#20
Senior Member
Join Date: Jan 2002
Location: Arcen, , NETHERLANDS
Posts: 6,571
Likes: 0
Received 2 Likes
on
2 Posts
RE: Mvvs 58 crankshaft movment
There should be some play. Remove it, and you loose 200 rpm!
Been there!
PS,
A drop of oil to the seal's sealing lip helps a lot in keeping the engine front healthy. Once the seal is run in properly that will become less important. If the prop turns obstructed, lubricate that seal lip! The oil supplied from the fuel mixture mist sometimes is not enough. Especially in very lean oil mixes some folks believe in.
Been there!
PS,
A drop of oil to the seal's sealing lip helps a lot in keeping the engine front healthy. Once the seal is run in properly that will become less important. If the prop turns obstructed, lubricate that seal lip! The oil supplied from the fuel mixture mist sometimes is not enough. Especially in very lean oil mixes some folks believe in.
#21
RE: Mvvs 58 crankshaft movment
PE,
Do you have a Liquid Cooled 58 and radiator in stock or can you tell me how long it may take to get one. Also, what are the current costs?
Thanks.
Bill
Do you have a Liquid Cooled 58 and radiator in stock or can you tell me how long it may take to get one. Also, what are the current costs?
Thanks.
Bill
#22
Senior Member
Join Date: Jan 2002
Location: Arcen, , NETHERLANDS
Posts: 6,571
Likes: 0
Received 2 Likes
on
2 Posts
RE: Mvvs 58 crankshaft movment
working on a drawing of the cooler I have in my hands right now.
Be patient please, will get back to you ASAP.
Engine availability is good, though they are assembled on request only. Takes a couple of weeks.
Cost etc. on my web pages www.mvvs.nl
Be patient please, will get back to you ASAP.
Engine availability is good, though they are assembled on request only. Takes a couple of weeks.
Cost etc. on my web pages www.mvvs.nl