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Simplex 6-7 hp

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saltycraig
New member
Username: saltycraig

Post Number: 1
Registered: 06-2018
Posted on Sunday, June 10, 2018 - 02:49 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi, I'm new to this forum but have a bit of a quandary.. My Simplex 6-7hp motor idles without any smoke. will run under load without smoke but when I dis-engage the gearbox and sit at idle it will begin to blow blue smoke (oil?)
Does anybody know why this might be happening?
After setting off again it will clear up in about 5 minutes!! wierd huh?
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kingfisher
Member
Username: kingfisher

Post Number: 29
Registered: 01-2013
Posted on Sunday, June 10, 2018 - 08:46 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

No idea really.
What oil are you using? Mono 30 is recommended. Does yours have a dipstick? Is the level ok?
Mark
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miro
Senior Member
Username: miro

Post Number: 973
Registered: 11-2001


Posted on Sunday, June 10, 2018 - 10:02 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

This usually happens when the valve guides are worn.
Under load there is little vaccuum in the intake manifold.
But when it is idling, the throttle is almost closed, and there is higher vaccuum in the intake, and oil gets sucked up past the valve stems and you'll get blue smoke.

The simplest solution is - live with it.
Next, replace the valve guides - yuck
Next, knurl the valve stems - less yuck but still way worse than the simple approach.
Then when you re-apply load, the intake vaccuum is reduced, oil is not sucked up past the valve stems and it burns clean.

Miro
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saltycraig
New member
Username: saltycraig

Post Number: 2
Registered: 06-2018
Posted on Monday, June 11, 2018 - 08:46 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Thanks Miro, your answer is a great help.
I'm considering solution 2!!
are you still able to get valve guides or would they be something I would have to fabricate my-self??
Cheers
Craig
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miro
Senior Member
Username: miro

Post Number: 974
Registered: 11-2001


Posted on Monday, June 11, 2018 - 10:44 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I suspect that you will not be able to get the guides as a spare part.
The trick will be to understand HOW to remove the old ones. Sometimes you can drive them into the crankcase but you may have to remove the camshaft fist ( the yuck factor). I've made custom pullers to pull them up out of the block. I did that once on a 4 cylinder and swore I'd never do another job like that ( more yuck)
But make sure that's the issue (worn guides) first before tearing into the engine.

You may want to review valve guide removal / installation manuals to give yourself some idea of the challenge.Old tractor engine manuals usually have the procedures.
Miro
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klanger
Senior Member
Username: klanger

Post Number: 128
Registered: 03-2012


Posted on Tuesday, June 12, 2018 - 06:28 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi Craig,
Simplex engines are still made in Sydney, and parts should be available.
Call them, Hardman & Hall
02 9624 6704
Kev
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saltycraig
New member
Username: saltycraig

Post Number: 3
Registered: 06-2018
Posted on Saturday, June 16, 2018 - 03:58 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Thanks Kev, I would also like to see weather there is a workshop manual with clearances and tolerances in it?
too much to wish for I suppose!!
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kingfisher
Member
Username: kingfisher

Post Number: 30
Registered: 01-2013
Posted on Saturday, June 16, 2018 - 08:54 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Simplex can provide you with a manual. About $25 by memory. May not have the detail you are looking for but lots of useful stuff.
Mark
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saltycraig
Member
Username: saltycraig

Post Number: 4
Registered: 06-2018
Posted on Saturday, June 23, 2018 - 07:38 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi guys/ and ladies I suppose.
I'm wondering if any of you know where I could get a "Roloroter" waterpump for my Simplex?
Are there reconditioning parts for them Also??
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saltycraig
Member
Username: saltycraig

Post Number: 5
Registered: 06-2018
Posted on Tuesday, February 05, 2019 - 09:48 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi.. Does anybody what the ring gap should be for a simplex engine?
According to the formula it should be between 16 and 18 thou for a bore size of 3 3/4".
Being an early built engine,, are the tollerance a little different?
the ring width is about 7/16ths...
Cheers
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jb_castagnos
Senior Member
Username: jb_castagnos

Post Number: 1413
Registered: 07-2002


Posted on Wednesday, February 06, 2019 - 07:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Minimum ring gap is critical, you don't want the rings to butt and seize. Larger gaps really don't hurt, rule of thumb is .004" gap per inch of bore. Many of the old engines with pinned rings had the pin on the bottom land, this usually ended up with a 3/16" or better gap and the engines ran fine.
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saltycraig
Member
Username: saltycraig

Post Number: 6
Registered: 06-2018
Posted on Wednesday, February 06, 2019 - 07:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Thanks Jb, thats helpful! It puts my mind at rest
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saltycraig
Member
Username: saltycraig

Post Number: 7
Registered: 06-2018
Posted on Saturday, February 09, 2019 - 06:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi, I've taken the head off my engine and lapped the valves.
I also noticed the bore could do with a hone (she ran too hot for a while)
looking at the head gasket, I noticed that the threee water jacket gallereys on the front of the head are not open on the new gasket!!
Should I ensure that all jackett gallerys are clear on the gasket to allow water flow?
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saltycraig
Member
Username: saltycraig

Post Number: 8
Registered: 06-2018
Posted on Thursday, May 23, 2019 - 08:20 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Does anyone know how loose or fine the setting on a model D schebler puffer valve should be?
after tuning the caby mixture , I find that under load it still runs rich (carbon build up in cyllander head)..
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ernie
Senior Member
Username: ernie

Post Number: 2524
Registered: 01-2002


Posted on Sunday, May 26, 2019 - 01:22 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

According to Schebler set the needle valve for a good idle. Then adjust the (in your words puffer valve) so it runs good. It sounds like you need it to be leaner at RPM which equals less spring tension.
Hope this helps
Ernie
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saltycraig
Member
Username: saltycraig

Post Number: 9
Registered: 06-2018
Posted on Sunday, May 26, 2019 - 07:24 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

thanks ernie, I had a sneeking suspicion that was the problem but I want some reassuence before I fiddled with an engine that is running.

Although not that well under load!!
cheers

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