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#1
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Engine prelubrication
I recently had an argument with an automotive technician (i am an
automotive service advisor) about engine prelubrication. As i have thoroughly read Jack Erjavec's excellent book "Automotive Technology, A System's Approach" i tend to believe that you have to prelubricate a newly rebuilt engine prior assembling it again. Technicians here have the opinion that engine prelubrication is not something very important for the reliability of the rebuilt engine. I would be happy to read your thoughts on that. Thanks! |
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#2
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Engine prelubrication
> wrote in message oups.com... >I recently had an argument with an automotive technician (i am an > automotive service advisor) about engine prelubrication. As i have > thoroughly read Jack Erjavec's excellent book "Automotive Technology, A > System's Approach" i tend to believe that you have to prelubricate a > newly rebuilt engine prior assembling it again. Technicians here have > the opinion that engine prelubrication is not something very important > for the reliability of the rebuilt engine. I would be happy to read > your thoughts on that. Thanks! > Yeah, Jack is a great author of automotive books and I use his text in my classes, but there are some things that are outdated. I used to think you were supposed to lap in a new valve with valve grinding compound, like it says in the book, but I was recently informed by some of the experts here in this forum that this is no longer done professionally. Perhaps some of those guys who are overhauling engines for a living could clue us in on this as well. I am curious to know what the industry standard is on that one as well. I have been told that using a pressurized engine pre-lube machine prior to start up is the way to go on a rebuild and the only reason to use assembly lube is to preserve the engine's shelf life if it will not be put into service soon after reassembly. Seems to me using assembly pre--lube would be the best way to go though. It's been years since I actually taught engine overhaul and back then we would use assembly lube, then we would use a pressure pre-lube right before cranking the engine. I did it that way mostly to teach both methods though. I find it hard to believe anyone would advocate not using assembly lube or pre-lubing the engine before start up. And what would be the advantage? -- Kevin Mouton Automotive Technology Instructor "If women don't find you handsome, they should at least find you handy" Red Green |
#3
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Engine prelubrication
> wrote in message
>I recently had an argument with an automotive technician (i am an > automotive service advisor) about engine prelubrication. As i have > thoroughly read Jack Erjavec's excellent book "Automotive Technology, A > System's Approach" i tend to believe that you have to prelubricate a > newly rebuilt engine prior assembling it again. Technicians here have > the opinion that engine prelubrication is not something very important > for the reliability of the rebuilt engine. I would be happy to read > your thoughts on that. Thanks! I don't know if prelube does anything at all to improve reliability these days. But I'll say that it sure makes assembly a lot easier, and it really reduces corrosion problems if you are taking your time doing the work and have a lot of parts on the shelf for a while. I could believe that prelubing isn't as important as it used to be, but grease isn't very expensive and it makes the work a little easier, I think. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#4
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Engine prelubrication
Scott Dorsey wrote: > > wrote in message > >I recently had an argument with an automotive technician (i am an > > automotive service advisor) about engine prelubrication. As i have > > thoroughly read Jack Erjavec's excellent book "Automotive Technology, A > > System's Approach" i tend to believe that you have to prelubricate a > > newly rebuilt engine prior assembling it again. Technicians here have > > the opinion that engine prelubrication is not something very important > > for the reliability of the rebuilt engine. I would be happy to read > > your thoughts on that. Thanks! > > I don't know if prelube does anything at all to improve reliability these > days. But I'll say that it sure makes assembly a lot easier, and it > really reduces corrosion problems if you are taking your time doing the > work and have a lot of parts on the shelf for a while. > > I could believe that prelubing isn't as important as it used to be, but > grease isn't very expensive and it makes the work a little easier, I think. > --scott > > > -- > "C'est un Nagra. C'est suisse, et tres, tres precis." But why prelubing nowadays is no more important given that lubrication systems have not been so much advanced in relation to the past? I must note that telling prelubing i mean pressurised prelubing and not assembly prelubing. |
#5
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Engine prelubrication
Kevin wrote: Seems to me using assembly pre--lube > would be the best way to go though. It's been years since I actually taught > engine overhaul and back then we would use assembly lube, then we would use > a pressure pre-lube right before cranking the engine. I did it that way > mostly to teach both methods though. > I find it hard to believe anyone would advocate not using assembly lube or > pre-lubing the engine before start up. And what would be the advantage? It's been 25+ years since I went to automotive tech school, but they were teaching back then that if you are going to be a tech just to overhaul engines, you will soon be out of a job. I feel that the instructors were correct, unless you are specialized or do it just on your own vehicles. With that being said, this subject will have many different views and probably none of them will be wrong or totally right. Here's my thoughts: Use assembly lube liberally. Don't use regular grease because it is "stringy" and can plug up an oil pickup tube. Assembly lube is not stringy. If you prelube, don't overdue it because it can wash away your prelube and the prelube has a lot higher stress/sheer factor than oil. Add a couple of squirts (just don't overdue it here) of engine oil into the combustion chambers to lube the compression ring on the initial start. Since most SM rated oils are now low on zinc, add a couple ounces of "break-in" lube or use a diesel rated oil on the initial oil fill. Keep the rpms higher than idle for the first 20 minutes. Do everything possible to get the engine to start immediately so that very little cranking is needed. (If carbed engine, prime the carb before cranking) 'Bout all I can think of. Arguments are welcome. |
#6
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Engine prelubrication
"Kevin" > wrote in message news:5NNug.66641$9c6.1699@dukeread11... > > > wrote in message > oups.com... >>I recently had an argument with an automotive technician (i am an >> automotive service advisor) about engine prelubrication. As i have >> thoroughly read Jack Erjavec's excellent book "Automotive Technology, A >> System's Approach" i tend to believe that you have to prelubricate a >> newly rebuilt engine prior assembling it again. Technicians here have >> the opinion that engine prelubrication is not something very important >> for the reliability of the rebuilt engine. I would be happy to read >> your thoughts on that. Thanks! >> > > Yeah, Jack is a great author of automotive books and I use his text in my > classes, but there are some things that are outdated. I used to think you > were supposed to lap in a new valve with valve grinding compound, like it > says in the book, but I was recently informed by some of the experts here > in this forum that this is no longer done professionally. Perhaps some of > those guys who are overhauling engines for a living could clue us in on > this as well. I am curious to know what the industry standard is on that > one as well. I have been told that using a pressurized engine pre-lube > machine prior to start up is the way to go on a rebuild and the only > reason to use assembly lube is to preserve the engine's shelf life if it > will not be put into service soon after reassembly. Seems to me using > assembly pre--lube would be the best way to go though. It's been years > since I actually taught engine overhaul and back then we would use > assembly lube, then we would use a pressure pre-lube right before cranking > the engine. I did it that way mostly to teach both methods though. > I find it hard to believe anyone would advocate not using assembly lube or > pre-lubing the engine before start up. And what would be the advantage? > -- > Kevin Mouton > Automotive Technology Instructor > "If women don't find you handsome, they should at least find you handy" > Red Green > Ok, I miss-read the original post. I thought he was talking about pre-lubing an engine during assembly. I now realize he was talking about those pre-lube devices that you can install on your engine to bring up the oil pressure each time before you start it. That's a whole nuther story. I guess I don't have any knowledgeable opinion on that one, other than I sure have had good success with all my vehicles that did not have a pre-luber installed. -- Kevin Mouton Automotive Technology Instructor "If women don't find you handsome, they should at least find you handy" Red Green |
#7
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Engine prelubrication
Did pressure pre oil on ally my race engines, plus the normal assembly lube,
800 plus hp, never had a failure related to break in, that being said, it is insurance against a failure during that critical start up period. All the above advice applies from the other knowledgeable posters, just a matter of how good a job you want to do. PS all race engine builders do this. > wrote in message oups.com... > > Scott Dorsey wrote: >> > wrote in message >> >I recently had an argument with an automotive technician (i am an >> > automotive service advisor) about engine prelubrication. As i have >> > thoroughly read Jack Erjavec's excellent book "Automotive Technology, A >> > System's Approach" i tend to believe that you have to prelubricate a >> > newly rebuilt engine prior assembling it again. Technicians here have >> > the opinion that engine prelubrication is not something very important >> > for the reliability of the rebuilt engine. I would be happy to read >> > your thoughts on that. Thanks! >> >> I don't know if prelube does anything at all to improve reliability these >> days. But I'll say that it sure makes assembly a lot easier, and it >> really reduces corrosion problems if you are taking your time doing the >> work and have a lot of parts on the shelf for a while. >> >> I could believe that prelubing isn't as important as it used to be, but >> grease isn't very expensive and it makes the work a little easier, I >> think. >> --scott >> >> >> -- >> "C'est un Nagra. C'est suisse, et tres, tres precis." > > But why prelubing nowadays is no more important given that lubrication > systems have not been so much advanced in relation to the past? > I must note that telling prelubing i mean pressurised prelubing and not > assembly prelubing. > > ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#9
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Engine prelubrication
> But why prelubing nowadays is no more important given that lubrication > systems have not been so much advanced in relation to the past? > I must note that telling prelubing i mean pressurised prelubing and not > assembly prelubing. Clarify for me.. are you talking about a rebuilt engine (like Jasper) or an engine that the mechanic has just finished reassembling themselves? Jasper engines are already pre-run.. something that I've rebuilt myself, even with assembly lube I'll do a little pressure prelube before I start it the first time. Jim |
#10
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Engine prelubrication
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