Robin America EH25-2 Service Manual Page 10
- Page / 66
- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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(a) Since Robin lubricating system makes use of the pressure fluctuations in the crankcase, a lead valve
is arranged at the lower part of the crankcase. By utilizing the negative pressure that occurs during
the piston rising stroke, lubricant oil is supplied from the oil tube (located inside the oil tank, that is
separated from the crankcase) to the crankcase, through the oil passage of the crankshaft which has
rotary valve that opens and shuts with an appropriate timing.
(b) At the same time, fresh air and blow-by air containing oil mist coming from the rocker arm compart-
ment are sucked through the two assist holes that open at the piston top dead center.
(c) The supplied oil is diffused by the crank arm and other parts, thereby transforming in mist.
That diffused oil mist is compressed during the piston lowering stroke, and an appropriate quantity of
the compressed oil mist is pumped to the cam gear compartment and to the rocker arm compartment
through the lead valve, and oil pasage. Thus, it lubricates the various parts of the engine. The remain-
ing oil mist returns to the oil tank via bypass hole.
(d) The oil tank has two pressure relief holes located at its left and right sides which are connected to the
assist hole of the cylinder unit. These pressure relief holes have the function to keep the pressure of
the oil tank constant.
(e) Oil inside the rocker arm compartment is sucked back to the crankcase by the strong negative pres-
sure inside the crankcase, through the two return paths located at the left and right sides.
(f) The blow-by gas and a small amount of oil mist flow from the rocker arm compartment to the oil
separator inside the air cleaner, through the breather pipe. Then separated into blow-by gas and oil
mist.
(g) The separated oil mist returns into the crankcase, passing through the assist hole of the cylinder.
Engine operation in tilted positions
(a) When the engine is tilted carburetor side down.
The return path at the carburetor side inside
the rocker arm compartment comes to the
lower position. Then, the stagnant oil is sucked
back to the crankcase. At that time, the check
valve of the pressure relief hole prevents oil
from flowing back, because the carburetor side
pressure relief hole, located inside the oil tank,
is in the oil.
Fig. 3-2
- EH025/EH035 1
- CONTENTS 3
- 1. SPECIFICATIONS 5
- 2. PERFORMANCE 6
- 2-4 PERFORMANCE CURVES 7
- TORQUEFUEL CONSUMPTION RATE 8
- Fig. 3-1 9
- Fig. 3-2 10
- Fig. 3-4 11
- Fig. 3-3 11
- 4-3 PISTON 12
- 4-4 PISTON RINGS 13
- 4-5 CAM GEAR 13
- 4-6 COOLING SYSTEM 13
- 4-7 LUBRICATION SYSTEM 13
- 4-8 IGNITION SYSTEM 14
- 4-9 CARBURETOR 14
- 4-10 AIR CLEANER 14
- Fig. 4-9 15
- CAMLIFTER 15
- CRESCENT CAM 15
- 4-12 SECTIONAL VIEW OF ENGINE 16
- Fig. 4-11 17
- Fig. 5-1 18
- Fig. 5-5 19
- Fig. 5-2 19
- Fig. 5-4 19
- Fig. 5-3 19
- Fig. 5-6 19
- Fig. 5-7 21
- Fig. 5-9 21
- Fig. 5-8 21
- Fig. 5-11 21
- Fig. 5-10 21
- Fig. 5-13 22
- Fig. 5-12 22
- Fig. 5-14 23
- Fig. 5-16 24
- Fig. 5-15 24
- Fig. 5-18 25
- Fig. 5-17 25
- Fig. 5-20 26
- Fig. 5-19 26
- Fig. 5-22 27
- Fig. 5-21 27
- Fig. 5-23 28
- Fig. 5-24 28
- Fig. 5-25 29
- Fig. 5-26 30
- Fig. 5-27 30
- Fig. 5-28 31
- Fig. 5-29 31
- Fig. 5-33 32
- Fig. 5-30 32
- Fig. 5-31 32
- Fig. 5-32 32
- Fig. 5-34 33
- Fig. 5-35 34
- Fig. 5-37 34
- Fig. 5-36 34
- Fig. 5-38 35
- Fig. 5-39 35
- Fig. 5-40 35
- Fig. 5-41 35
- Fig. 5-43 36
- Fig. 5-42 36
- Fig. 5-44 36
- Fig. 5-45 37
- Fig. 5-47 37
- Fig. 5-46 37
- Fig. 5-48 38
- Fig. 5-49 38
- Fig. 5-50 39
- Fig. 5-51 39
- Fig. 5-52 40
- Fig. 5-54 41
- Fig. 5-55 41
- Fig. 5-56 42
- Fig. 5-57 42
- Fig. 5-58 43
- Fig. 5-59 44
- Fig. 5-60 44
- 6. MAGNETO 45
- Fig. 7-1 46
- Fig. 7-2 46
- Fig. 8-1 47
- Fig. 8-2 48
- 8-2-1 PRECAUTIONS 49
- Fig. 8-3 50
- Fig. 9-1 51
- Fig. 9-2 52
- Fig. 9-3 53
- Fig. 9-4 53
- Fig. 9-5 53
- Fig. 9-6 54
- 10. TROUBLESHOOTING 55
- 10-1-3 IGNITION SYSTEM 56
- 10-2 ENGINE MISFIRES 56
- 10-3 ENGINE STOPS 56
- 10-4 ENGINE OVERHEATS 57
- 10-5 ENGINE KNOCKS 57
- 11. INSTALLATION 58
- 12. SERVICE DATA 59
- Unit : mm (in) 60
- MAINTENANCE ITEMS REMARKS 64
- 2) Clean air cleaner 64
- PRINTED IN THE USA 66
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