Bumper Guardian Technical Articles

Tech Article Graphic

Current PNR members who have contributed Technical Articles to the Bumper Guardian include: Bill Allard, Scott Anderson, Lou Berquest, Tom Brace, John Campbell, Frank Daly, Bill Deibel, Craig Devine, Val Dickison, Ron Doss, Marty Ellison, Colin Gurnsey, Brian Harding, Barrie Hutchinson, Karen Hutchinson, Brad Ipsen, Sig Linke, Ray Loe, Roy Magnuson, Phil McCurdy, Al McEwan, John McGary, Bill Mote, Paul Murray, Sandy Olson, Kim Pierce, Brian Rohrback, Jon Schoenfeld, Ashley Shoemaker, David Smith, and Jim Tait.

Issue number and page number are supplied in the columns to the left. Where trimmed links to the articles are available, the Topic column at the Right is in Bold type. Here are the categories with listing of article location following:

CommunityOil & FuelsRestoration
ElectricalPaint & SurfaceSpecs
Engine & TransmissionPartsTires & Wheels
JudgingRadiator & CoolingTouring


2009-223Richard AndersonRestoring Alice Ramsey’s Maxwell
2011-124Karen HutchinsonThe Art of Racing in the Rain
2013-122Val DickisonTech Tips From the Passenger Seat
2018-18Marty EllisonGo Engineer
2018-237Brian RohrbackPowering the Future
2019-127Val Dickison

Die Cast Values


1967-314Oil Belt RegionReverse Polarity
1969-213Kerry GaulderGenerators and Voltage Regulation
1995-23Bill DeibelOn the Subject of Batteries
1997-210Ian MatthewsPrinciples of Electricity
2001-416AnonSpark Interference for Radios
2002-117Paul MurrayMicrotip: Static Electricity
2004-211Bill DeibelMicrotip: Spark Plugs
2005-417Don ReddawayGenerator Cutout Conversion
2006-113Bill DeibelGenerator Cutout – Addition
2006-219Don ReddawayReplacing Battery Cables
2007-111Bill DeibelProcuring Old Electronics
2008-328Bill DeibelElectric Starter
2008-418Bill DeibelLincoln Continental Coil
2009-215Rohrback & ArnoldAvoiding Blackouts and Brownouts
2010-224Don ReddawayDelco 3-Brush Generator
2012-122Bill DeibelWire Insulation
2013-425Karen HutchinsonLED Lights for Classics
2014-223Bill DeibelBattery Cut-Off Switches
2014-226Bill DeibelCandles, Gaslights and Flash-Bangs
2014-422Colin GurnseyClassic Radios
2015-118Gunnell & ShoemakerSpring Battery Check Up
2015-419Bill DeibelIgnition Part Sources 
2015-420Bill AllardAdjusting Points
2015-421Bill AllardAudible Turn Signals
2017-120Bill DeibelWarning Lights
2018-321Marty EllisonBatteries
2018-323Kirk WhiteBattery Care
2019-123Bill DeibelMore Batteries
2019-222Al McEwanStalled Hispano
2019-413AnonLucas Headlamps


1968-117Colorado ClassicistEngine Warm-Ups
1968-115Perfect Circle Piston Ring Co.Cylinder Honing
1976-17Alec UlmannDuesenberg Racing Engine
1991-511Brian FirthSpeed is the Substitute for Cubes
2008-48Brad IpsenCadillac V-16 Engine Design
2016-318Brad Ipsen1938 Cadillac V-16
2016-320Brad Ipsen & Ray LoeCadillac Evolution
2019-315Bill AllardCylinder Head Manufacture
2019-47Terry McGeanHydramatic


1965-25George ShufeltIs Elegance Restorable?
1992-415Ron DossCleaning Tech Tips
1993-29Dick CulpHere Comes the Judge
1998-111Carl SteigJudges Accreditation Program
2009-415Karen HutchinsonJudging Experience
2010-115Brian HardingJudging
2010-312Don ReddawayPreparing for a Grand Classic
2011-110Brian HardingConcours Judging Part IV: In the cabin
2012-118Brian HardingJudging the Exterior
2012-29Brian HardingJudging Seminar


1965-416Pete ManelloShop Talk
1965-514Pete ManelloSticky Hydrolic Lifters
1970-115Perry and Daphne FowlerUltrasound Cleaning
1972-19James DoughertyTrouble Shooting
1972-18Bill LockeShocks
1974-15Frank StarrMaintenance Tips
1983-46Jim DoughertyPreventing Car Fires
1985-25Arthur CaldwellRemoving Frozen or Broken Bolts
1988-211Packard Service BulletinUnderstanding Hydrolic Lifters
1993-519Roy MagnusonTire Tips
1994-27CCCA: The Joy of TouringElectrical and Wiring
1994-27Ron DossThe Perfect Battery
2000-216Jack CollinsDamaged Holes for Trim Screws
2001-120AnonStuck in Gear
2004-211Bill DeibelMicrotip: Condensers
2004-215Sam BarerSafety Check for Classics
2004-315Sam BarerUnderstanding SU Carburators
2005-213Don ReddawayMicrotip: Minor Car Repairs
2006-112Lou BerquestOverdrive Installation
2006-217Bill DeibelOverheated Overdrive
2006-311Don ReddawayRebuilding a Stromberg Carburator
2006-414Don ReddawayClark Transmission Rebuild
2007-313Bill Mote & Gary SteinmanElectric Fuel Pump Installation
2008-219Bill DeibelThe API Service Category System
2009-227Val DickisonWindshield Replacement 101
2010-118Brian RohrbackBentley Service Instruction
2010-322Bill AllardRing and Pinion Replacement
2010-420Bill AllardFixing Oil Leaks
2011-19Bill DeibelReproduction gas sending unit
2012-111Don ReddawaySmall tools, carburetor, gaskets
2012-211Don ReddawayMicrotips: Rust and pot metal repair
2012-311Scott AndersonMicrotips: Tool Care and Gel Wax
2012-315Bill AllardStartix Repair
2013-111Bill AllardMicrotip: Removing Corrosion
2013-312Bill AllardGrease Cup Re-sealing
2014-126Bill DeibelFixing Screws that don’t tighten


3Chevron Tech BulletinUnleaded Gasoline and Classics
13Louis DurkeeMotor Oil and Lubricant Tips
7Bill DeibelA Few Words About Gasoline
13Bill DeibelVapor Lock and Antiknock
20Gary RussellWhat Kind of Oil to Use
19Bill DeibelUnderstanding Motor Oil Distinction
7Les HugginsOil containing Zinc
15Bill DeibelUpdate on Motor Oil
10Brian RohrbackGasoline by the numbers
23Don ReddawayNew Gas Troubles
30Frank Frisch via Bill DeibelSnapUps
14Brian RohrbackIndustry Part 1: Octane
23Brian RohrbackIndustry Part 2: Octane Measure
15Brian RohrbackIndustry Part 3: Refineries
10Brian RohrbackIndustry Part 4: Fuel Blending
11Brian RohrbackProperties of Gasoline
16Brian RohrbackIndustry Part 5: Alcohol
22Brian RohrbackIndustry Part 6: Water
23Brian RohrbackOxygenates
22Brian RohrbackIndustry Part 7: Fuel Adulteration
23Bill DeibelAlcohol & Vapor Lock
22Brian RohrbackIndustry Part 8: Transportation
18Brian RohrbackIndustry Part 9: Motor oil
21Brian RohrbackGas Station History
20Brian RohrbackIndustry Part 10: Extraction
22Brian RohrbackIndustry Part 11: Oil Exploration
22Brian RohrbackIndustry Part 12: Origin of Oil
2020-320Brian RohrbackIndustry Part 13: Encapsulation


1967-117Richard TerhunePainting Your Classic
1975-210Lauren MatleyAutomotive Refinishing
2012-219Colin GurnseyClassic Colours
2015-228Kim PierceBondo
2016-120Kim PiercePaint a Car Part I
2016-326Kim PiercePaint a Car Part II
2017-421Bill AllardPowdercoating @ Home
2018-236Kim PiercePaint Maintenance


1965-413George ShufeltNuts and Bolts
1969-417Auto GlassTypes of Glass
2012-124Bill DeibelBleak Outlook for Aftermarket Parts
2014-420Frank Frisch via Bill DeibelBrake Shoe Springs
2015-17Bill DeibelCarburator Repair
2015-221Lucy AllardMr. Bijur and his System Patent
2015-222Val DickisonBijur Oil Delivery System
2015-316John CampbellEmergency Fan Belt
2016-110Frank DalyAuxiliary Fuel Pumps
2019-122Sandy OlsonOlson’s Gaskets
2019-227AnonRescue Tape
2019-426Karen HutchinsonHeadlamp Covers
2019-425Colin GurnseySeatbelts
2020-28John and Mary CampbellUnobtanium Parts


1967-418Ben MorganCooling System Problems
1996-28Tom SumnerAvoiding Overheating
2001-417Bob AgnewCoolant
2004-211Bill DeibelMicrotip: Radiator Boiling Points
2008-316Barrie HutchinsonRadiator Expansion Chamber
2012-319Colin GurnseyCooling the Aussie Way
2013-28Kennedy, Harris, & MalksAntifreeze
2013-210Bill DeibelMicrotip: Antifreeze


1964-18Bob JohnsonRestoration Tips
1964-26Doug SpenserValve Restoration
1964-34Doug SpenserValve Restoration Part 2
1964-48Bob JohnsonRestoration Tips
1965-19George ShufeltFirst Things First
1965-416Al McEwanRestoration Hint
1965-415N. Illinois RegionPlating Pot Metal
1967-214Roy BourlandPlating Tech Tip
1967-313Bill FerrisRemoving Carriage Bolts
1967-39L.F. BrehmerUpholstering Your Classic
1967-417Bill FerrisParts, Polish and Plastic Steel
1968-117Oil Belt RegionMaterials List for Restoration
1970-212Perry and Daphne FowlerWelding Pot Metal
1970-211Tim HowleyElectroplating
1972-19Luke PetersGlass Scratches
1983-36Tom BraceSisyphus Revisited
1983-54Ken NewWoodgraining Made Easy
1989-49Pete McManusGas Tank Restoration
1993-519Golden Era MotorsWheel Repair
2001-217Bill DeibelReproduction Idler Gear
2006-424Bill DeibelRestoring a Black-Out Car
2009-112Phil McCurdyRestoration: The Body Rotator
2019-118Craig Devine3D Printing
2019-119Barrie Hutchinson3D Printing Example
2019-324Craig Devine3D Printing 2
2019-3a18John McGaryOil Pump
2021-322Jim Tait3D Printing 3


1965-29ReprintFeatures of a Cord
1975-13Sigfried LinkeSupercharged Mercedes
1999-46Gary JohnsonLiquamatic Drive (41-42 Lincoln)
1999-47Gary JohnsonReo-Royale Self-Shifter Transmission
2002-414AnonPackard Carburators
2010-25Raymond LoeChrysler T&C
2016-35Jon Schoenfeld1937 Cadillac Specs


2000-216Allan FranzMicrotip: Hissing Tires
2003-215Josh MalksRadial Tires on Classics
2006-421AnonBreaking in Tires
2009-38Wohlwend & HutchinsonWhy Cord Wheels Crack
2015-335Colin GurnseyClassic Tires


2005-213Don ReddawayMicrotip: Tour Repairs
2007-216Chris WantuckTrailering 101
2008-214Raymond LoeThe Doble Steam Car
2008-217Gary JohnsonComplete CARavan List
2011-123Karen HutchinsonCost of a Tow
2015-130Colin GurnseyTouring Tips – 1
2015-230Colin GurnseyTouring Tips – 2
2019-29Gary JohnsonCARavan List