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

RAM OHE CMG IO-550-N (Cirrus SR22)
Engine Overhaul Specifications

RAM OHE IO-550-N 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 - 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.
  • New - rod and rocker arm bushings, bearings, seals, valve springs, valve keepers, intake & exhaust valves
  • Cylinders - CMG New Steel Cylinder Package - NE
  • Intake valve seats - venturi type (rounded)
  • Intake valve guides - with improved oil control seals.
  • Rocker arm boss - strengthened
  • Connecting rod cap to rod mating surfaces resurfaced
    and honed to new limit tolerances
  • All grind areas are steel shot peened
  • Rods balanced - exchange -
    [ CMG spec. ]
  • Balance: pistons and rings by vendor specs; pins RAM specs. - exchange
  • Push rod housing and applicable external steel hardware are
    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 lobe profiles offer reduced valve train loads and improved fuel economy.
  • Crankshaft - to new limit tolerances at std., or .010 under - OHE
  • Crankshaft assembly with counterweights, bushings, pins and
    internal gears installed - balanced. RAM specification.
  • Exchange Core Crankshaft must be a VAR type - OHE

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.

Cylinder Upgrade Options
• Upgrade CMG cylinders to nickel: $1,700 per engine.
• Ask your RAM Representative for current market prices for CMG NiC3 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:
  • Starter with relay - NE
  • Starter drive - OHE
  • Magnetos - CMG - OHE
  • Magneto Harness - Champion - new
  • Spark plugs - new
  • Fuel injection system - OHE
  • Throttle Body - OHE
  • Induction couplings, clamps,
    and duct - new
  • Air filter - new
  • Oil cooler: Flushed and inspected - exchange
  • Oil filter - new
  • Oil pressure relief valve kit
    and spring - new
  • 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.

Not Included:
Magneto sensor assembly, alternator, secondary alternator, A/C compressor, prop governor, hoses, exhaust risers and exhaust parts are not included unless specified by an optional purchase order and a RAM Work Order Supplement issued at the time of engine order placement.
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 RAM OHE engine shipment, or 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 Overhauled 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 five years. For complete details go to www.ramaircraft.com/ramtbowarranty

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