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DE-18

1. value a the positive and negative directions A Replacing Consumables and Measuring 5 Slowly turn the engine in the normal direction Instruments of rotation and measure the reading on the a Replacing Consumables scale when the crankshaft is at the angle of Darts List B C D E and A respectively of which data shall be recorded 1 O ring frame side cover 2 2 No 3 b Implements and Measuring Instruments 1 General tools LL Implement List in the final docu ments 2 Deflection gauge 3 Mirror B Conditions for Measuring Deflection a Deflection of the crankshaft varies according to the temperature Be sure to measure it when the engine is in cold state b Before measurement push the contact piece Deflection Gauge Mounting Position of the deflection gauge with a finger and confirm that both the contact piece and dial gauge return to the original positions correctly c In the case of the marine engine since the deflection varies according to the loaded cargo conditions be minded to record the conditions of loaded cargo draft temperature and so on at the same time DE 18 Z 12 01 DAIHATSU Before Revision Inspection and Maintenance Inspection and Maintenance Measuring Crankshaft Deflection D Calculating Deflection d Calculate the deflection values as based on the measured values in accordance with the following formula record the calculated value
2. No GS13 007 1 B SUBJECT ii FA RR 7B ENGINE MODEL Ae DE 18hRRIO 7 FV 7 HT DZ Ya Ve iz BOT FERED 7 IY TT ARERI ey hLEHIO LOA RPS AS all asc EAEL PADY FLAW E ORD 6 BBIF IVA Ya RMRI A 20127FllA K V AFO R V REHE Z Ua LELEDTOEKALET lt ET AR gt OF ALA Ya rRNR FYRA ME DIED T PO YADA F BCZ E ORECA YO WE EREE amp ita OBS VR eI a amp SUCH D FASII hime LO 9 8mOME CHH LERS Ma MEIERE a 1 23 L5 Mal ni ROT RO Hales CAME ZAT BLETOC CHEMBVRLET FILIVaLY TS Pe Deflection Gauge Mounting Position qd CLE Bll Before Deflection gauge _ TILIA amp 9Page 2013 8 2 FTLINITI EIREXE CSHES EB 7531 0076 Ahi KAP 17 618305 DAIHATSU DIESEL MFG CO LTD AFTER SALES SERVICE DEPT 1 30 OYODONAKA 1CHOME KITA KU OSAKA 531 0076 JAPAN TEL 81 6 6454 2347 FAX 81 6 6454 2680 DE 18 R Arts HS ra FIL IV av RARI ODT DE 18 Revision of operation manual for crankshaft deflection measurement NOTE When carrying out the deflection on DE 18 engine it was found that the connecting rod big end was coming in contact with the deflection gauge at one position In order to get more positive and easy reading without dropping of the deflection gauge there was some amendments that we carried out in the Manuals from Nov 2012 The revised contents is as follows lt Revised contents gt The position at which the deflection gauge is mounted is changed from crankshaft web to th
3. asured when the engine is warm as standard DE 18 Z 12 01
4. cting rod bolt during turning the crank shaft value A Replacing Consumables and Measuring Instruments a Replacing Consumables 4 Set the reading on the gauge scale to 20 at the position B in the Figure To make clear the positive and negative directions LLI Parts List 5 Slowly turn the engine in the normal direction 1 O ring frame side cover 2 2 No 3 of rotation and measure the reading on the b Implements and Measuring Instruments scale when the crankshaft is at the angle of B C D E and A respectively of which data shall be recorded 1 General tools LL Implement List in the final docu ments 2 Deflection gauge 3 Mirror B Conditions for Measuring Deflection a Deflection of the crankshaft varies according to the temperature Be sure to measure it when the engine is in cold state b Before measurement push the contact piece of the deflection gauge with a finger and confirm that both the contact piece and dial gauge return to the original positions correctly c In the case of the marine engine since the deflection varies according to the loaded cargo conditions be minded to record the conditions of loaded cargo draft temperature and so on at a the same time Gauge head Deflection gauge Balance weight Deflection Gauge Mounting Position DE 18 A 12 11 DAIHATSU After Revision Inspection and Maintenance Inspection and Maintenance Mea
5. e crankshaft balance weight Because of change in position of the measuring point an adjustment value or correction factor has to be taken into account multiplied when calculating the deflection Correction Factor a Measurement point correction factor a 1 23 When the deflection gauge measures 98mm as shown figure from the balance weight end face We herewith attach the before manual and the revised manual page for your kind reference OE amp After INGYAIDISE e j Balance weight AEF Gauge head After Revision CHAPTER Inspection and Maintenance 5 SEN Inspection and Maintenance 4 6 Measuring Crankshaft Deflection 5 4 6 Measuring Crankshaft Deflection C Measuring Deflection lt Measurement procedure gt 1 Open the indicator valve and perform turning If the crankshaft deflection exceeds its limit the crankshaft the stress to be applied to the crankshaft becomes excessive and it results in the breakage of crankshaft if the excess of deflec tion is too large 2 Place the crank pin at the point of 30 posi tion B past the bottom dead center 3 Mount the deflection gauge as shown in the figure Deflection Gauge Mounting Position Therefore adjust the crankshaft deflection to the proper value when being installed and periodically measure the deflection so that it can be corrected whenever it is over the limit Be careful not to interfere with the threaded conne
6. liner so that the deflection falls when the limited values as shown in the above table The deflection of the crankshaft shall be represented by the value when the engine is cold and when the engine is warm sometimes differ significantly depending on the measure ment conditions be minded not to use the value measured when the engine is warm as standard DE 18 A 12 11 Before Revision CHAPTER Inspection and Maintenance 5 SEN Inspection and Maintenance 4 6 Measuring Crankshaft Deflection 5 4 6 Measuring Crankshaft Deflection C Measuring Deflection lt Measurement procedure gt 1 Open the indicator valve and perform turning If the crankshaft deflection exceeds its limit the crankshaft the stress to be applied to the crankshaft becomes excessive and it results in the 2 Place the crank pin at the point of 30 posi tion B past the bottom dead center breakage of crankshaft if the excess of deflec l n 3 Install the deflection gauge to the position tion is too large oo The position is about the same line of the Therefore adjust the crankshaft deflection NDR journal outer diameter and it is a point of to the proper value when being installed and periodically measure the deflection so that it can be corrected whenever it is over the limit intersection of center line in crank arm 4 Set the reading on the gauge scale to 20 at the position B in the Figure To make clear
7. s e Vertical V deflection dV D awe e Horizontal H deflection dH C E e Positive negative deflection Open downward closing downward A B C D and E represent the measured val ues respectively at each corresponding position shown in the figure on the right Top dead center Deflection Measuring Position Seen from flywheel side 30 30 D Top dead center Dial Gauge Reading DAIHATSU CHAPTER 5 ITEM a The correction limit shall apply to whichever is larger of dV and dH as shown in the following table E Correction Limit for Deflection Unit mm a Adjusted value Allowable limit In case of i 0 028 or less 0 078 x stroke x stroke 10 T In case of direct 0 028 or less 0 078 connection Both side 0 084 or less 0 112 b Deflection varies depending on the connection method direct connection or flexible coupling between the crankshaft and drive equipment however usually the deflection becomes maxi mum at the crank throw that is closest to the fly wheel Adjust the drive equipment using the adjust ing shim or chock liner so that the deflection falls when the limited values as shown in the above table The deflection of the crankshaft shall be represented by the value when the engine is cold and when the engine is warm sometimes differ significantly depending on the measure ment conditions be minded not to use the value me
8. suring Crankshaft Deflection E Correction Limit for Deflection D Calculating Deflection d Calculate the deflection values as based on the measured values in accordance with the following formula record the calculated values e Vertical V deflection dV D awe e Horizontal H deflection dH C E e Positive negative deflection Open downward closing downward A B C D and E represent the measured val ues respectively at each corresponding position shown in the figure on the right Top dead center Deflection Measuring Position Seen from flywheel side 30 30 D Top dead center Dial Gauge Reading DAIHATSU CHAPTER 5 ITEM a The correction limit shall apply to whichever is larger of dV and dH as shown in the following table Unit mm a Adjusted value Allowable limit Direction In case of 0 034 or less xX stroke X 10 000 In case of direct 0 034 or less connection x stroke X Q x stroke X 1 10 000 10 000 In case of direct 0 103 or less x stroke X 0 Note Measurement point correction factor 1 23 b Deflection varies depending on the connection method direct connection or flexible coupling between the crankshaft and drive equipment however usually the deflection becomes maxi mum at the crank throw that is closest to the fly wheel Adjust the drive equipment using the adjust ing shim or chock

DE-18

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