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> Drex 914, Iowa 914
Drex
post Sep 27 2023, 04:19 PM
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(IMG:http://www.914world.com/bbs2/uploads_offsite/www.surfacezero.com-27003-1695853156.1.jpg)

here are the cylinders and pistons
probably will have cylinders honed
and buy new rings

should I buy new pistons?

thanks

Dave


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Drex
post Oct 4 2023, 08:26 AM
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couple of questions for the 1.7 engine:

are the right and left heads identical?

are all the cylinders identical?

is there a good thread on this?

i know that it is important to disassemble and reassemble
all parts in the same place and orientation
and i plan to mark this on all the parts.
is it possible to mistakenly put the heads on the wrong sides
or will they only fit one way?

Dave
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Drex
post Oct 5 2023, 10:24 AM
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More questions

I see when ordering pistons and cylinders etc.
that they are listed as 90mm/93mm

Does this mean that the piston is 90mm
and the cylinder is bored out to 93mm?

I have restored six vehicles
but never performed engine work

Thanks

Dave
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Drex
post Oct 18 2023, 05:22 PM
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(IMG:http://www.914world.com/bbs2/uploads_offsite/www.surfacezero.com-27003-1697671323.1.jpg)

took heads down to mechanic
valves ok but will need new guides
so will be sent away for 2-3 weeks

of interest, mechanic's dad used to use this old honer!
they don't use it now

dave
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MikeK
post Oct 19 2023, 08:44 AM
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All of the cylinders/pistons are the same. The heads are symmetrical from side to side. Keeping the cylinders with their piston isn't really necessary as things will change once honed. What is critical is piston fit to the bore. You may consider buying a new, big bore set of pistons which will get you closer to 2.0 l, if yours are scuffed or worn.

If I were in your shoes:

Heads rebuilt with new guides, three angle valve job and a light flycut of the sealing surface. I'd consider new exhaust valves. CC the heads so they match. I'd do a little hand work to port match the manifolds, clean up the intake runners, etc..

Have the rods rebuilt and balanced, polish the crank, surface the flywheel, have the crank dynamically balanced with the fan, flywheel and clutch. Pin the clutch so it only goes on one way.

Clean and measure the pistons. Hone the cylinders. Check ring gaps. Balance pistons to within a gram or less.

Check the case to see if it needs a line bore and/or thrust cut. Have oversized bearings in hand before any cutting is done on the case. Deck the case bores so the cylinders have a nice surface to seat against.

That will get you on your way. Plenty more detail to go into once you start on the motor, like blue printing the oil pump, ensuring bearing oiling hole alignment and correcting it and some measuring, deburring the cam, checking cam gear engagement, etc...

Plenty of details, but getting a well balanced bottom end with the correct bearing clearances and a good set of heads is fundamental.
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Drex
post Oct 21 2023, 11:12 AM
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lots of good things to do to an engine
i probably won't do some of them
the heads and cylinders are at shop for rebuild
think i will buy an ultrasonic parts cleaner
thanks for advise
dave
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krazykonrad
post Oct 22 2023, 12:48 PM
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QUOTE(Drex @ Oct 21 2023, 09:12 AM) *

lots of good things to do to an engine
i probably won't do some of them
the heads and cylinders are at shop for rebuild
think i will buy an ultrasonic parts cleaner
thanks for advise
dave


Ultrasonic parts cleaner is the way to go. I have been pleased with the one I got from Amazon, but the advertised volumes are significantly smaller in real life.
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Drex
post Oct 24 2023, 05:36 PM
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i'm thinking about getting the 6L model

also

https://www.youtube.com/watch?v=0mS1WNll3hs

is it possible to have a 72,000 mile car this perfect
and completely original?

Dave
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vintagethunder
post Oct 25 2023, 02:21 PM
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Did you get an engine yoke yet? I noticed about half say the 2 arm ones are crap, and the other half say they use them with no issues. I just got the one from LJ Air-Cooled Engines and am satisfied.

I did have a problem with the stand, as some (including the Samba guy who is no longer building his yokes) said the newer HF 1 ton stands had the 2 3/8" ID top tube that is required for many of them, but the stands at my local HF are more like 1 15/16".
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Drex
post Oct 27 2023, 05:07 AM
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(IMG:http://www.914world.com/bbs2/uploads_offsite/www.surfacezero.com-27003-1698404821.1.jpg)

i went with the more expensive QSC from amazon

currently am waiting for all the parts to OH the heads
also, ordered new rings and piston snap rings
should come in the next few days from Auto Atlanta

more later

Dave
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Drex
post Nov 12 2023, 02:04 PM
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My heads are at the machine shop
I ordered new valve guides from Auto Atlanta
and was sent the oversize intake guides for 1.7 1.8

It turns out that their O.D.'s measure 13.06 mm and are too large
The ones removed from my heads have an O.D. of 12.06 mm
Also, the new guides have a lip at one end which is absent on my original guides

I called AA and they told me that the 13's are the right ones!
that the head would have to be heated up and the guides cooled down
in order for them to be pressed into the heads!!

Is this true, or do they make a 12.06 mm intake valve guide?

What do you all think of this?

Thanks

Dave
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Shivers
post Nov 12 2023, 02:55 PM
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I do not know for sure. But I asked google after looking at your heads. So I asked for valve guides for 1.7-1.8 heads and this was what I found.
https://sierramadrecollection.com/products/...AiABEgJJH_D_BwE
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Drex
post Nov 12 2023, 03:13 PM
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yes, those are like the ones I received
But they are also 13.06 mm
The ones that came out of my heads are definitely 12.06 mm
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Drex
post Nov 13 2023, 04:31 PM
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(IMG:http://www.914world.com/bbs2/uploads_offsite/www.surfacezero.com-27003-1699914679.1.jpg)

this is the new intake valve guide AA sent me
actually, they sent 6 exhaust VGs and 2 of these intake VGs

surely my old ones are original
am trying to talk to the shop mechanic at AA

thanks

dave
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Drex
post Nov 16 2023, 02:21 PM
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Apparently no one makes the original 12.06 mm intake valve guides
this is because there was a problem with them slipping when engine warmed up

So they went to the 13.06 mm guides with a collar on them
one has to have the heads
reamed out to 13.058 (VG O.D. - 0.002)
heat the heads, cool the guides, and press them in

The collar end goes on the spring side

Thanks

Dave
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porschetub
post Nov 17 2023, 09:21 PM
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QUOTE(Drex @ Nov 17 2023, 08:21 AM) *

Apparently no one makes the original 12.06 mm intake valve guides
this is because there was a problem with them slipping when engine warmed up

So they went to the 13.06 mm guides with a collar on them
one has to have the heads
reamed out to 13.058 (VG O.D. - 0.002)
heat the heads, cool the guides, and press them in

The collar end goes on the spring side

Thanks

Dave

Strange way do it end result will be the same ,seem to remember running an internal bore mic down the heads and machining the guides in a lathe to correct interference fit then the only reaming required is to suit new valves you are fitting which I hope you are or @ least the exhaust valves .
IMO re-ringing pistons is false economy unless they have ring grooves in spec and pistons that measure up for bore clearance after a hone which even with your lowish mileage will most likely not be great.
Just don't want to see you disappointed with oil burning which is the main issue with worn pistons /bores ok.
For the cost of all this checking and measuring go to 1.8 barrel and piston set with higher CR pistons ,a small increase in power and solves a lot BS later on .
Good luck Dave.
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Drex
post Nov 19 2023, 07:04 PM
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would a 1.7 case, heads and valves
except 1.8 pistons and cylinders?

Dave
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Shivers
post Nov 19 2023, 08:56 PM
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QUOTE(Drex @ Nov 19 2023, 05:04 PM) *

would a 1.7 case, heads and valves
except 1.8 pistons and cylinders?

Dave


This is a Jake Raby quote: “The 2.0 (94 or 96mm) cylinders will fit into the 1.7 or 1.8 crankcase exactly as they do the 2.0!!!! NO MACHINE WORK IS NEEDED AS ALL REGISTERS ARE THE SAME SIZE!”

So as long as the pin location is the same I see no reason it wouldn’t.
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Drex
post Apr 18 2024, 04:56 PM
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Iowa is back...

had several non 914 issues to resolve this winter
(a very mellow Iowa winter BTW)

but now am ready to continue my restoration

is the ultrasonic cleaner best for cleaning engine parts?
what solution is best with this?

also, what sealer is best for the ring that
goes between the cylinder and the case?

glad to be back

Dave
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