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Tach drive delete?
So quick trip to Oshkosh and new Lycoming cylinders are ordered, getting serious about assembling an 0-360. I wanted to check with engine experts here on the current thoughts of deleting the tach drive during engine assembly. Reading through previous posts I have noticed cons with both approaches.
1. Engine destroyed because tach drive was operating unloaded and failed. 2 Engine destroyed because I removed the tach drive and all the oil departed the breather line. Hoping for more encouraging advice that does not result in engine destruction. -Bruce:confused: |
Bruce, install the drive gear assemble. There is no downside to installing it.
If you delete it please report your findings. |
Reassembly of my 540 saw me delete not only the tach drive shaft, but one magneto idler gear and shaft assembly, swapped the fuel pump eccentric idler with the just deleted idler gear, deleted the fuel pump pushrod, and the vacuum pump drive gear, shaft and housing.
One needs to evaluate oil flow when eliminating parts in the accessory case. Many (like the idler gear and vaccum pump drive) are integral to the pressure lubrication path. Many people pull the vaccum pump shaft and leave the housing, not realizing they have just created a massive internal oil leak. Its great to reduce rotating mass, but think it through before you start deleting stuff. |
I appreciate the thoughts and your experience. Looking at the accessory case there is not an oil path feeding the tach drive, looks to be splash lubrication. In this case there will not be a massive internal oil leak causing low oil pressure.
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Have had mine for 20-years and more than 3,000 flight hours. |
Tach drive
After some back & forth email with our very own Lyc guru Mahlon I left mine out.
Don Broussard RV9 Rebuild in Progress 57 Pacer |
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Fuel pump drive?
Along the same lines, what about the fuel pump pushrod?
If the mechanical fuel pump is not going to be used, can the pushrod for the fuel pump be left in place, or does the accessory case need to come off and the rod removed? Thanks |
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5 electric tach experimentals, 8,000+ hours and one expensive failure = no more tach drives for me. |
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