| How to exchange the bearings of an RB Concept
engine. |
| This sequence is valuable for all engine sizes of our line of
RB Concept engines, of course not all the details in the pictures will be the
same but its the principal matter which we try to explain here. |
| |
Before you disassemble your engine
be sure to clean your engine very well so no dirt can go inside your engine and
be sure to follow the instructions below.
- Work on a clean spot !
- Use adapted tools!
Proceed as follows:
- Clean the entire engine on the outside,
the less dirt you have around the better it is for the engine.
- Take off the carburetor.
- Unscrew the glowplug.
- Unscrew the 4 head-screws(do this
crosswise!).
- Take off the cooling-head and the
combustion chamber, be careful with the head-shimms(the one's between the
combustion chamber and cylinder), don't loose them.
- Unscrew the 4 backplate screws(do this
crosswise!).
- Take off the backplate, be careful that
when you want to take off the back-plate to have the piston in the upper
position, otherwise you can damage your piston.
- Take out the cylinder.
- Take out the piston/conrod(when you do
this the position of the crankshaft must be that the piston is at its highest
position).
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 If you have problems to
lift off the conrod from the pin(which is a good sign) we here use a small
wrench No.7(see picture). |
| |
 Normally
the conrod will lift for about 3mm which is then sufficient to get behind the
conrod and so you can use the small wrench to lift the conrod until it gets of
the pin of the crankshaft, do this gently and also proceed 1 time left and 1
time right, etc... |
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 Heat up the crankcase
on an electric cooking plate(position 6 should do).
Wait until the oil which is inside the engine starts to smoke a
little(after 3-4 minutes). |
| |
 Take the crankcase of
the cooking plate with a heat protective glove and hit firmly the back of the
crankcase on a wooden plate until the main-bearing comes loose.
Be careful not to burn your fingers and if the bearing does not
come loose put back the crankcase on the electric plate and wait a little more
so the crankcase heats up more. |
| |
 The bearing has come
out here.
Please note that the bearing sometimes
comes out of its place but is a little stuck after, this happens, just align
the bearing so it falls out after. |
| |
 Immediately
after(while the crankcase is still at the right temperature) you must also take
out the front-bearing.
This can be done by
introducing a round axle(here it is a tool for nuts) for which the diameter is
smaller then the inside size of the main-bearing you just got out of the
engine.
Hit the front-bearing gently so it comes
out, be careful not to damage the inside of the crankcase! |
| |
 The front-bearing has
come out here. |
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- Now you can let everything cool down or
immediately mount the new bearings, for this we suggest that you put the
crankcase on the electric plate again and do the following after.
|
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 Mount the new
main-bearing on the crankshaft with the balls closest to the
crank-flange. |
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 Mount the
front-bearing with the rubber(or metal) flange directed to the thicker part of
the crankshaft, this because we need to insert the front-bearing in the
crankcase. |
| |
 Get the
crankcase(carefull hot...) and slide in the front-bearing in the crankcase with
the help of the crankshaft.
Wait some seconds
and pull-out the crankshaft, the bearing should stay in place.
Put the front-bearing in place quickly otherwise the bearing
will take the temperature and get stuck.
If this
happens, don't panic, you should be able to put the front-bearing in place
after you have pulled out the crankshaft and pushing the bearing in place with
the wood you have used the get the main-bearing out. |
| |
 Pull-out the
crankshaft a few seconds after you have put the front-bearing in
place. |
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 Then immediately after
insert the crankshaft in the rear of the crankcase and let the crankshaft and
bearing fall in place, turn the crankshaft to see if it turns free and let the
whole thing cool down.
Once again be careful not
to burn yourself with this. |
| |
 | We also have available a special dedicated tool
which aligns the bearings perfectly and you can use this tooling to mount the
bearings also when the crankcase is cold. This tooling is available for the
following internal bearing diameters:- 14mm #01150-14T
- 13mm #01150-13T
- 11.5mm #01700-475-11.5
- 11mm #01700-075-11
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- When everything has cooled down, check if the
crankshaft turns free.
- Mount the piston/conrod in the engine by placing
the conrod over the pin of the crankshaft(when you do this the position of the
crankshaft must be that the piston is at its highest position).
- Mount the cylinder, first slide the cylinder
about 5mm into the housing and then let put the piston in the cylinder, then
put the cylinder in place(add a little oil #1400 to make this all go
smooth.
- Mount the backplate, be careful that when you
mount the back-plate to have the piston in the upper position, otherwise you
will damage your piston.
- Mount the back-plate screws and tighten them
crosswise.
- Mount the combustion-chamber and do not forget
the shims!
- Mount the cooling-head and fix the cooling-head
with the screws, do this crosswise.
- Tighten again the glowplug.
- Mount the carburetor.
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After you have exchanged the
bearings, you can use the engine as is, normally no need to run them in but a
little easy at the beginning does not harm the engine. |
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| These
tips are given only to help you to maintain your engine in top condition, we
cannot be responsible for mistakes made by your side. |
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