- 07-23-14 02:48 AM #1Cadillac Owners Member
- Automobile(s): 1983 Eldorado ht4100
- Join Date
- Sep 2011
- Mezica, Slovenia
HT 4100 Camshaft break-in!
I am planning to change camshaft in my 4100 HT. When i received camshaft from seller there was a note included i should use zinc additive
for flat tapped camshaft. Then i have started researching and i have noticed that some people also use zinc paste for cam shaft break-in and also on lifters. What is your opinion, and what type of engine oil should i use after replacement?
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- 07-23-14 09:06 AM #2
Re: HT 4100 Camshaft break-in!
Use a cam break-in lube paste from any of the cam manufacturers - Comp, Lunati, Engle, Edelbrock - wipe each cam lobe and lifter face with the paste. Lube the cam bearings with 30W engine oil. Oil the cam chain/gears with 30W. Run a HighMileage 10w-30 or a fleet/marine 10W-30 like Shell Rotella, Chevron DELO, Pennzoil LongLife. These all contain higher levels of ZDDP (zinc/phosphorus) additives to prevent flat tappet cam scuffing.
When the engine is all together, oil pan filled, oil filter prefilled, check timing and start the engine. As soon as you verify oil pressure accelerate the engine to 1500 rpm, NO LOAD, and leave it there for 10 - 15 minutes. This does the initial cam break-in.
Any cam literature will tell you basically the same procedure. I build Olds 455 and GM 454 boat engines (some are very trick) and if I use a flat tappet cam this is the exact procedure I use - 25 years now, never a problem.
Olds 455 bored to 461, 530 hp on 87 octane. Marine conversion..................note the coolant-cooled manifolds.
- 08-04-14 03:50 PM #3
Thanks for the advice. I will follow your procedure.