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#1
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Manual transmission causes crankshaft wear!
I have very recently found out something about early crankshaft wear that is caused, believe it or not, by starting the engine with the clutch depressed.
Wheather you have a push or pull clutch, depressing the clutch while starting a cold engine causes wear on the crankshaft journal that keeps the crankshaft from walking. I will now ONLY START THE ENGINE in neutral. Once the engine is running there is oil pressure and minimal wear is experienced. Tom
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www.svxfiles.com The first SuperCharged SVX, ![]() the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway ![]() Fiberglass Hood thread My locker 4.44 Swap link |
#2
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Re: Manual transmission causes crankshaft wear!
Now that I think about it, I have always put my cars and bikes in neutral when starting. It's just the way I've always done it. On a 2 stroke dirt bike you can feel the extra force necessary to kick it over in gear.
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#3
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Re: Manual transmission causes crankshaft wear!
I believe that the engine that I just took apart has less than 7000 miles on it since I built it using the best of everything. The walk on the crankshaft was 0.032". It should be no more that 0.0045". I installed a new bearing to recheck it and the walk was 0.020''-0.018". The wear was only on one side of crankshaft, on the side that the crankshaft gets pushed to when the clutch is depressed.
I have to replace the crankshaft, or find thicker bearings for it in terms of width, to compensate for the crankshaft wear. Note, I would only try this on my personal engine after much more research!
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www.svxfiles.com The first SuperCharged SVX, ![]() the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway ![]() Fiberglass Hood thread My locker 4.44 Swap link |
#4
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Re: Manual transmission causes crankshaft wear!
As an aside I lost my phone that had every ones phone number on it.
![]() If you would like me to have your number it is the one listed on my website that ends with 2837. Thanks. ![]()
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www.svxfiles.com The first SuperCharged SVX, ![]() the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway ![]() Fiberglass Hood thread My locker 4.44 Swap link |
#5
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Re: Manual transmission causes crankshaft wear!
this is true, but almost all cars nowadays have a clutch safety switch so starter won't engage unless clutch is pushed in…..now, on my BRAT it never had that feature, but newer cars do. Would have to defeat the switch
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1985 Brat GL 138k 91 CRX Si 40k 91 CRX Si 155k 97 SVX Lsi 70k 2003 s2000 91 RT4WD 166K |
#6
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Re: Manual transmission causes crankshaft wear!
I once used shim stock and a pair of scissors to add a bit of thickness to the thrust washers. Slipped them in behind the thrust washers. Worked a treat and a lot cheaper than a new crank.
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1995 Caterham 7 Twincam 2002 Porsche 911 targa -- now with FSI 4.0L power! 2007 BMW 328i Cabriolet 2012 Tacoma 4wd v6 Access Cab 2013 Mercedes E350 4Matic Wagon 2005 STi - totaled after 10 great years 1994 SVX LSi 5spd - sold but not forgotten 2000 Legacy GT 5spd sedan - gone after 150K miles of bliss |
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