Bpladmin at 03:15, 30 March 2026

2026-03-30T03:15:25Z

← Older revision		Revision as of 20:15, 29 March 2026
Line 28:		Line 28:
	<s>Plan is to use [http://www.flyefii.com/system-32/ FlyEFII System32].</s>		<s>Plan is to use [http://www.flyefii.com/system-32/ FlyEFII System32].</s>

	Reverting back to original idea of using Airflow Performance fuel injection, a modern version of Lycoming RSA style. EFII is just too much wiring.		Reverting back to original idea of using [https://airflowperformance.com/ Airflow Performance] fuel injection, a modern version of Lycoming RSA style. EFII is just too much wiring.

	=== To do: ===		=== To do: ===

Bpladmin at 03:12, 30 March 2026

2026-03-30T03:12:08Z

← Older revision		Revision as of 20:12, 29 March 2026
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	== Ignition and injection ==		== Ignition and injection ==

	Plan is to use [http://www.flyefii.com/system-32/ FlyEFII System32].		<s>Plan is to use [http://www.flyefii.com/system-32/ FlyEFII System32].</s>

			Reverting back to original idea of using Airflow Performance fuel injection, a modern version of Lycoming RSA style. EFII is just too much wiring.

	=== To do: ===		=== To do: ===

Bpladmin: Created page with "200px Lycoming IO-540-C4B5 Serial #: L-15798-48 Parallel valve, narrow deck engine core as it arrived from Wentworth Aviation in Minneso..."

2026-02-04T01:38:58Z

Created page with "border|200px Lycoming IO-540-C4B5 Serial #: L-15798-48 Parallel valve, narrow deck engine core as it arrived from Wentworth Aviation in Minneso..."

New page

[[File:Io-540-c4b5-crated.jpg|border|200px]] Lycoming IO-540-C4B5 Serial #: L-15798-48
Parallel valve, narrow deck engine core as it arrived from Wentworth Aviation in Minnesota. Ready to disassemble.

Here's my [https://flic.kr/s/aHskCX9meJ Flickr photo gallery]. I'll move pics over here when topics require.

== Rebuild ==
I have rebuilt this core engine after it suffered a prop strike during a gear-up landing in a Piper Aztec in 2014. Nearly every component of the bottom end was in good serviceable condition save for the crankshaft, which was cranked at an oil cross tube. Replacement crankshaft is from a O-540-F1A5 out of a Robinson R-44.

This has been the most thorough and complete task of the Bearhawk build thus far.

[[File:540-harvard.jpg|1200px|frameless]]

=== To do: ===

* Bolt [[cylinders]] on - DONE
* Install [[oil drain-back nipples]] in case - DONE
* Install idler gears - DONE
* Determine which gears are being omitted from [[accessory case]] - DONE
* Clean pushrods in Graham's parts washer - DONE
* Powdercoat [[intake pipes|intake tube clamps]] or find machined new ones - DONE
* Cut new [[intake pipes|intake pipe]] hose into 1.75-2.00" sections
* Constant pressure clamp pliers
* Rocker covers, gaskets, hardware - INSTALLED
* Intercylinder baffles - INSTALLED

== Ignition and injection ==

Plan is to use [http://www.flyefii.com/system-32/ FlyEFII System32].

=== To do: ===

* [[Fuel valve mount bracket]] placement.
* [[Fuel line routing and design]]

=== Lycoming resources ===

{| class="wikitable"
|-
! File name !! Type !! Size
|-
| [[:File:Lycoming-OH-Manual.pdf|Lycoming overhaul manual]] || PDF || 15.2 MB
|-
| [[:File:Io540-c4-parts.pdf|IO-540 Parallel Valve Narrow deck IPC]] || PDF || 7.6 MB
|}

Engine - Revision history

Bpladmin at 03:15, 30 March 2026

Bpladmin at 03:12, 30 March 2026

Bpladmin: Created page with "200px Lycoming IO-540-C4B5 Serial #: L-15798-48 Parallel valve, narrow deck engine core as it arrived from Wentworth Aviation in Minneso..."