7505 Karl May Drive • Waco Regional Airport • P.O. Box 5219 • Waco, TX 76708
Phone: (254) 752-8381 • Fax: (254) 752-3307 • www.ramaircraft.com

Engine Overhaul Specifications

RAM OHE TSIO-520 engine - exchange
  • Engine dynamic parts and tolerances overhauled within new limits per CMG overhaul manual, or better per RAM specifications
  • Certified crankcase housing used that meets RAM’s standards for application and installation of new internal parts or parts overhauled to new limit tolerances - OHE
  • Comply with all AD’s
  • Comply with Service Bulletins through category three (3)
  • Applicable steel parts
    magnaflux inspected
  • All engine counterweights, gears and castings replaced as required.
  • Rod & rocker arm bushings, bearings, seals, valve springs, valve keepers, intake & exhaust valves - new
  • Cylinders - SAP Millennium New Steel Cylinder Package - NE
    • Through-hardened steel barrels
    • Volumetrically matched intake and exhaust ports
  • Intake valve seats - venturi type (rounded)
  • Intake valve guides - with improved
    oil control seals
  • Connecting rod cap to rod mating surfaces resurfaced and
    honed to new limit tolerances
  • All grind areas are steel shot peened
  • Rods are balanced for both total weight and end weight to within one (1) gram maximum weight variance between the heaviest and lightest per set of six rod assemblies
  • Balance: pistons & rings by vendor specs; pins RAM specs. - exchange
  • Reference lines, push rod housing and applicable external steel
    hardware - cadmium plated
  • External aluminum parts -
    primed and painted
  • Crankcase - heavy - incorporates RAM’s 7th stud cylinder pad
    to cylinder base hold down/clamp assembly - OHE
  • Camshaft - RAM high-efficiency
    [ T210/T206 w/ - M & -R = CMG ]
  • Crankshaft to new limit tolerances at std., or .010 under
  • Crankshaft assembly with counterweights, bushings, pins and
    internal gears installed - balanced to RAM specifications
  • CMG Maintenance Manual M-0 through bolt service bulletin complied with alternate STC compliance.
  • Cylinder pad through bolts - new

OHE = Overhauled Exchange
NE = New Exchange - OEM or PMA
New = New Outright - OEM or PMA
New Items = Subject to test time,
ferry time and inventory time.

Not Included:
Vacuum pump, alternator, tach generator, hoses, exhaust risers and exhaust parts are not included with the RAM OHE engine unless specified by a RAM Work Order Supplement.
Cylinder Upgrade Options
• Upgrade SAP Millennium cylinders to nickel: $1,700 per engine.
• Ask your RAM Representative for current market prices for CMG cylinders.
Fine Wire Spark Plugs
Made of iridium alloy, these spark plugs produce a more efficient spark for extended plug life and better engine performance. Upgrade from standard massive plugs to fine wire spark plugs. Per engine - new: $840
Accessory Specifications:
  • Applicable where item is included in specific engine sales package.
  • Starter and starter drive - OHE
  • Magnetos - Champion Slick -
    pressurized 6320 - NE
  • Magneto Harness - Champion - new
  • Spark plugs - new
  • Turbocharger - balance to Mfr.'s specifications - OHE
  • Turbo controller and throttle body - OHE
  • Overboost relief valve - OHE
  • Fuel injection system - OHE
  • Intercooler - (as applicable) cleaned and pressure tested - exchange
  • Intercooler - (Series VII) improved - larger 140 in³ - NE
  • Induction couplings & clamps - new
  • Air filter - RAM PMA new
  • Oil breather system - inspected
    and repaired
  • Oil cooler: Flushed and inspected - exchange
  • Oil filter - new
  • Oil pressure relief valve kit
    and spring - new
  • Metal baffles refurbished & painted per spec. sheet. Gaps sealed.
  • Baffle seals - RAM SureStand - red silicone rubber - new
  • Specifications applicable to RAM’s overhaul of TSIO-520-NB, -LB,
    -WB, -VB, -EB, -M & -R engines, with necessary adjustments for fuel system, induction system and turbocharger system as applicable
  • Subject to Change: Specifications are subject to change due to availability of PMA new or factory new parts; vendor, factory, or RAM overhauled parts; or re-use of low time parts at customer’s request. As applicable to RAM’s FAA approved DER, DAR, STC and PMA authority, parts or procedure changes will be made at RAM’s discretion when in the customer’s best interest.

OHE = Overhauled Exchange
NE = New Exchange - OEM or PMA
New = New Outright - OEM or PMA
New Items = Subject to test time,
ferry time and inventory time.

Exchange Cores - Return Policy:
  • Engine, crankshaft, crankcase, exhaust, accessories, propeller, governor, and hardware items are only sold on an exchange basis, based upon the customer’s exchange of like type and normal run-out cores as removed from subject aircraft, and serviceable to RAM’s overhaul engine specifications.
  • Cores should be returned within 30 days of engine shipment, and immediately
    with a RAM installation.
  • Non-serviceable core fees may be due and payable to RAM. Engines or RAM products may be delivered prior to verification of exchanged cores.
  • If cores are found non-serviceable, the applicable non core fee will be invoiced with payment due to RAM within 30 days.
RAM Overhaule Engine TBO Warranty:

100% Engine and accessories, for the 1st year, or 500-hrs, whichever occurs first. Thereafter, the engine only is warranted on a prorata basis to TBO at RAM’s reduced minimum accrual rate of only 30 hours per month, thus extending coverage over four years. For complete details go to www.ramaircraft.com/ramtbowarranty

Unfeathering Accumulator:
Due to propensity for older prop unfeathering accumulators to contaminate the engine oil supply, existing unfeathering accumulators will be disabled, unless replaced with newer units. OHE: $875 / each [ Core Charge: $400/each ]
RAM Aircraft, LP • 7505 Karl May Drive • P.O. Box 5219 • Waco, TX 76708
Phone: (254) 752-8381 • Fax: (254) 752-3307 • www.ramaircraft.com