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| Re: [GMCnet] Rebuilt Engine Break-In Procedure [message #325484 is a reply to message #325480] |
Fri, 27 October 2017 11:00   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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This is what I do with newly rebuilt engines that have new rebores and new
pistons fitted, along with camshafts, lifters, valve guides and valve
stems, timing chain and sprockets, rod and main bearings and reground or
polished crankshaft along with new oil pump. Everything inside that engine
that rubs, rolls, or reciprocates against new parts needs to scuff in to a
compatible wearing surface. Lots of fine and some not so fine metal parts
get rubbed off in the process, and if they end up in the wrong place, can
do a great deal of damage. So, knowing that, don't do anything that creates
a huge amount of friction or heat until those parts scuff in to each other.
How long that takes is subject to discussion. Some subscribe to the, "Drive
it like you stole it theory", and some to the "Treat it like it is going to
break any second, now". I defer to my education and experience over many
years of doing this stuff. It all starts long before you hit the starter
for the first time. You have to have start up lubrication on every wear
surface in the engine before you start it. When the cam and lifters and cam
bearings are installed, the cam manufacturer has some very specific
instructions about the lubricants to be used. So do the piston and ring
manufacturers. I use cam lubes, Lucas Oil assembly lube, vasoline in the
oil pump gears, and because S and J provides it with each rebuilt engine
that I install, Joe Gibbs Racing Oil in the pan. S and J installs their
engines in a test facility with a large electric motor that turns the
engine over. It is called a Simtest Machine. By turning the engine they can
measure the amperage draw on a newly rebuilt engine to tell how tight it
is. It does not expand the rings in the bores, or load the piston tops like
combustion pressure does, so it is not an actual break in. I am NOT A FAN
of breaking a new engine in on a Dyno. They have their purposes, but I
prefer to break an engine in the way that it will be used in service.
Always, always have the ignition timing exactly set before you start a new
engine, and if possible, prelube the oil system either with the oil pump or
a pressure vessel attached to the gallery. Always have the radiator filled
as well. Exhaust system connected. If you are going to run headers, and you
have a fancy set of them with ceramic coating, wait until after you break
in the cam and lifters before you install them or you will burn the coating
off of them. They often get red hot during this phase of the break in.
After following the camshaft manufacturers specific instructions, let the
engine cool overnight and retorque manifolds. Then drive it, using short
bursts of heavy throttle followed by "balloon footing' it to allow cooling.
Do not drive with the cruise control for the first 10,000 miles. (my
personal dislike). Avoid prolonged periods of wide open throttle for the
first 10,000 miles. You should be good for many years with a good break in.
Change the break in oil at 100 miles or so. Use the oil of your choice, and
don't switch brands.
Jim Hupy
Salem, OR
78 GMC Royale 403
On Fri, Oct 27, 2017 at 8:03 AM, Rob Mueller
wrote:
> Ray,
>
> Call Dick Paterson (705) 325-4554 and he'll tell you EXACTLY what to do,
> he's forgotten more about rebuilding engines than "we"
> know! :-)
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
> USA '77 Kingsley - TZE 267V100808
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Ray
> Erspamer
> Sent: Friday, October 27, 2017 9:07 AM
> To: gmclist@list.gmcnet.org
> Subject: [GMCnet] Rebuilt Engine Break-In Procedure
>
> Good Morning
>
> I will be picking up my rebuilt engine next week. I've been researching
> "Engine Break'In Procedures" for rebuilt engines and the
> recommendations are all over the map, kind of like
> discussions/recommendations on engine oil.
>
> I'd be interested in hearing what members of the group think would be the
> best break-in procedure.
>
> Thanks
>
> Ray
>
>
> _______________________________________________
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