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Author Topic: Best method to flush a motor  (Read 4287 times)

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Offline Lee

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Best method to flush a motor
« on: October 13, 2005, 06:04:48 PM »
Before I start assembly, and paint, I'd like to flush the motor of any debris that may have fallen in and make sure the oil passages are clear. Any suggestions on the best method? I do have about 1/2 a 5gal jug of kerosene left, but am scratch'n my head on how to flush it through. Any thoughts would be appreciated. Thanks.

Oh, and while I'm at it, primer or no primer?

Thanks,
Lee

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76 - CB750K my baby
75 - CB400F Restored/Modified
and a 73 - CB750K2
and a 74 - CB750K4
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Offline Mossy21

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Re: Best method to flush a motor
« Reply #1 on: October 13, 2005, 07:34:54 PM »
  I did the same to my engine last winter.  First off I primed my engine with zinc chromate primer. The avaition industry us it on all aluminium parts so the paint sticks, it's green or yellow in colour.
  As for flushing the engine.......use a cheap filter and oil for the first 100kms then, change it out with the good stuff and there you go a very clean engine.  Hope this helps. :)
« Last Edit: December 24, 2006, 04:54:34 AM by Glenn Stauffer »
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Offline 78 k550

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Re: Best method to flush a motor
« Reply #2 on: October 13, 2005, 07:43:19 PM »
Compressed air.
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Paul
Littleton, CO

76/77 CB 750F, 
75 GL1000, (AKA GL1-242 NGWClub),
76 GL1000 LTD
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Offline Lee

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Re: Best method to flush a motor
« Reply #3 on: October 13, 2005, 10:40:56 PM »
Thanks guys,
I'll keep you posted on the progress. I'm sure I'll have more questions when I start to assemble the motor. My first time in attempting a major overhaul and this board has been a great resource! Can't wait to get it on the road.

Mossy I really like the look of that motor. How'd you get the edge of the fins like that? I was going to attempt that but this project has been going on now for too long so I just painted them.

Looks great!  ;)

Here's the cylinders and head, ready to go!

« Last Edit: December 24, 2006, 04:58:02 AM by Glenn Stauffer »
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76 - CB750K my baby
75 - CB400F Restored/Modified
and a 73 - CB750K2
and a 74 - CB750K4
No One can have just one...
Novato, California

Offline Mossy21

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Re: Best method to flush a motor
« Reply #4 on: October 14, 2005, 05:12:23 AM »
Your cylinders looks great......I used a 1 inch wide hand file and ran it lenght ways (the direction if air flow) until the paint was all gone, you will have to remove some metal to get the even look your looking for. :)  Heres the other side of mine.....I get nice comments on my engine all the time.
Keep up the good work......I'll be worth it.
« Last Edit: December 24, 2006, 05:05:18 AM by Glenn Stauffer »
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Offline hymodyne

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Re: Best method to flush a motor
« Reply #5 on: October 14, 2005, 05:23:17 AM »
I did the same to the sides of my head fins... its a nice touch. wish I had used the zinc chromate primer though, I shot the engine case and jugs, head, valve cover with silver and black respectively... looked nice at first, but after a couple of thousand miles, the case shows scratches where the paint has begun to just peel off, and the head, jugs and valve cover have begun to look flat and weathered.

perhaps I'll re-do the job this winter. any  concerns with the zinc chromate and high temperature applications?

hym
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Offline bryanj

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Re: Best method to flush a motor
« Reply #6 on: October 14, 2005, 05:35:47 AM »
Best method to flush:-
Strip it right down, use a proper parts washer and reassemble clean.
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Offline Mossy21

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Re: Best method to flush a motor
« Reply #7 on: October 14, 2005, 05:48:19 AM »
I never had any problem with the zinc chromate primer, for that matter I didn't like the look of high heat paints so I used non high heat and never had a problem. The engine doesn't get hot enought to burn it off.
I have a full summer of use on the bike since and the engine looks like new.........
PS The paint I used was call ARMOUR COAT.  Hope this helps. :)
« Last Edit: October 14, 2005, 12:43:19 PM by Mossy21 »
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eldar

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Re: Best method to flush a motor
« Reply #8 on: October 14, 2005, 07:41:01 AM »
Hey mossy, that looks like a K8 or 7? Nice ride there! Hope I can get mine looking that good over the winter. Having a bike in storage for 4 years then not being able to get it out till september, does not give much time for prettying things up and riding. Guess which one  I chose??? Cant tell it looks bad on the hyway!
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Offline dusterdude

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Re: Best method to flush a motor
« Reply #9 on: October 14, 2005, 07:43:45 AM »
eldar,of course it looks bad on the highway,its a k8.hahahahaha ;D
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mark
1972 k1 750
1949 fl panhead
1 1/2 gl1100 goldwings
1998 cbr600 f3

eldar

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Re: Best method to flush a motor
« Reply #10 on: October 14, 2005, 07:51:34 AM »
Hey It makes it onto the highway. Them K1 riders cant find the end of the driveway!
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Offline dusterdude

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Re: Best method to flush a motor
« Reply #11 on: October 14, 2005, 08:01:21 AM »
man,you`re sharp as a tack today.
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mark
1972 k1 750
1949 fl panhead
1 1/2 gl1100 goldwings
1998 cbr600 f3

eldar

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Re: Best method to flush a motor
« Reply #12 on: October 14, 2005, 08:10:09 AM »
Ahh still morning, so it is a dull tack right now. Mornings are bad! Evil I tell you, as evil as them aussies!
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Offline Mossy21

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Re: Best method to flush a motor
« Reply #13 on: October 14, 2005, 12:46:57 PM »
Hey elder......Thanks for the compliment.  The bike is a 1978 and I love it !
Note : Click on clip for the full view............
« Last Edit: December 24, 2006, 05:07:16 AM by Glenn Stauffer »
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If I can't see the Engine I can't see the point.......

Offline dusterdude

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Re: Best method to flush a motor
« Reply #14 on: October 14, 2005, 12:55:08 PM »
duane,would you mind shooting a pic of the back and from the side at the rear also,thanks
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mark
1972 k1 750
1949 fl panhead
1 1/2 gl1100 goldwings
1998 cbr600 f3

Offline Mossy21

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Re: Best method to flush a motor
« Reply #15 on: October 14, 2005, 01:20:45 PM »
Not a problem....Let me know if that's OK.
« Last Edit: December 24, 2006, 05:10:12 AM by Glenn Stauffer »
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Offline Raul CB750K1

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Re: Best method to flush a motor
« Reply #16 on: October 14, 2005, 01:34:04 PM »
I'm not joking this time; I've read in a couple of places that the best way is to boil the cases for about 20 minutes. Then you will see the glass beads on the bottom of the bucket. Never tried myself but probably will.


Raul
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Offline bhkrause

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Re: Best method to flush a motor
« Reply #17 on: October 14, 2005, 06:27:00 PM »
I'm still looking for a picture of a really BIG toilet...   :D :D
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original sohc #2663
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eldar

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Re: Best method to flush a motor
« Reply #18 on: October 15, 2005, 09:55:06 AM »
That really is a nice bike. I think I will get rid of my fairing now! Is the the original front fender? Did you cut it or just leave the rear brace off?

Can you take a front shot of the headlight/signal light area? See the fairing was one when I got the bike and so I am not sure what all hardware I will need to get to put it back to original.
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Offline joeb

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Re: Best method to flush a motor
« Reply #19 on: October 16, 2005, 08:11:34 AM »
I'm getting ready to rebuild my motor and was wondering where you get the zinc chormate primer , from a regular paint store?? And how do you apply with air gun or rattle can???   Also whats the best way to get the old paint off. I have a 78 750 super sport most of the engines hs original black paint on it. thanks 
« Last Edit: October 16, 2005, 08:16:02 AM by joeb »
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Offline Mossy21

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Re: Best method to flush a motor
« Reply #20 on: October 16, 2005, 11:47:43 AM »
  Joeb, I stripped the engine with a (rattle) spray can remover for aluminum, then I sprayed the engine down with brake cleaner to remove all oils and stripper residue.
  Then heat the engine surface with a hair dryer so the primer dries well.  Repeat for the paint. All painting was done with rattle cans and it works fine for me. 
  As for the zinc chromemate primer, I got mine at the air port were I work, you should be able to get it at an Automotive shop.  Ask them if you could special order it in.  If that's no good.......know anyone at your local air port ?  Hope this helps. :)
« Last Edit: December 24, 2006, 05:10:57 AM by Glenn Stauffer »
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Offline Mossy21

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Re: Best method to flush a motor
« Reply #21 on: October 16, 2005, 11:59:31 AM »
Eldar,  That is the factory front fender just cut shorter at the back.  I wasn't really happy with the look of the thing. 
  As for the pics of the front here you go........I didn't have the factory headlight brackets, so I bought these at the local bike shop, they were like $10.00 new.  I have a spare headlight complete if you need one ?  PM me for the price. :)
« Last Edit: December 24, 2006, 05:12:05 AM by Glenn Stauffer »
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Offline Lee

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Re: Best method to flush a motor
« Reply #22 on: October 16, 2005, 12:16:47 PM »
Joeb,

I don't know about the zinc-chromate primer, but I can offer my experience regarding paint removal, rust removal and general clean-up, and what's worked for me on this little project. You may already know this stuff, so I apologize if I cover something you're already familiar with.

It depends on the item you're working on. If you can remove it and wash it, like alt & clutch covers, then aluminum paint stripper is your best friend. But watch out, this is strong stuff, take common sense precautions, rubber gloves and ventilation is well advised. More than one application will likely be needed.

On the engine itself, I used a combination of the items below. I got excellent results with the nylon orange (course) and blue (fine) wheels. On open areas the scotch-brite disk and wheel worked very well too. I do NOT recommend you use a wire wheel.

I would also recommend a high speed drill, mine was variable speed up to 2500 rpm, it worked very well. (I.e. quicker).

Have an arsenal of tools on hand, and go for it!! I did acquire a bead-blast cabinet but really haven't found it useful. Maybe because I don't have a compressor big enough to push it. 

As far as painting goes, I think most will agree, CLEAN, CLEAN, CLEAN. A clean surface is paramount to good results way down the line. Brake cleaner seems to be my best friend as of late. I love this stuff, cleans with no residue. Stay away from rubber though.

Hope that is useful.
Lee
« Last Edit: December 24, 2006, 05:19:02 AM by Glenn Stauffer »
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76 - CB750K my baby
75 - CB400F Restored/Modified
and a 73 - CB750K2
and a 74 - CB750K4
No One can have just one...
Novato, California

Offline Mossy21

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Re: Best method to flush a motor
« Reply #23 on: October 16, 2005, 01:01:25 PM »
Lee,   That engine cover looks like a factory part.......Very nice !
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Offline Lee

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Re: Best method to flush a motor
« Reply #24 on: October 16, 2005, 01:49:27 PM »
Thanks Mossy,

It's been a long time in coming. Now if I could just get to the 'assembly' rather than 'dis-assembly' part of this project!!!

TakingforeverLee
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76 - CB750K my baby
75 - CB400F Restored/Modified
and a 73 - CB750K2
and a 74 - CB750K4
No One can have just one...
Novato, California
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