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bo124rs(at)hotmail.com
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 Posted: Tue Jul 04, 2006 12:53 pm Post subject: Engine alignment |
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Started working on the cowling this morning and ran into a little question
mark.
On my case, there is a little ridge where the bottom two engine mounts
contact the case. I put a large washer between the Barry mount and the case
on the bottom, otherwise the engine mounts would not be flush on the case.
http://rvflying.tripod.com/alignment1.jpg
I did not put any washers on the top. My thinking was Lyc had taken this
into consideration with the ridge in the bottom two.
http://rvflying.tripod.com/alignment2.jpg
So, when I placed the upper cowling in place, there is an increasing gap
from top to bottom. Me thinks this does not look right!!
http://rvflying.tripod.com/alignment3.jpg
Anyone run into this? What are my options, put a large washer between the
top to mounts and the case?
Dana Overall
Richmond, KY i39
RV-7 slider, Imron black, "Black Magic"
O 360 A1A, C/S C2YK-1BF/F7666A4
http://rvflying.tripod.com/id30.html
do not archive
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lhelming(at)sigecom.net
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| Posted: Tue Jul 04, 2006 1:50 pm Post subject: Engine alignment |
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Dana, you want to space it evenly at the front. You do whatever you need to
do to the back to achieve the perfect front. You probably sand/cut stuff
off back there and if you take too much off, you get to add it back later.
You want about 3/8" to 1/4" gap that pic 3 shows to be uniform all around.
Put a spacer in there and clamp it down or it will move when you go to
drilling the cowling to the firewall. You want the cowling to be a bit low
from being perfect to the spinner position so when the engine drops/sags a
bit after a few hours of use, you will be closer to perfect. Indiana Larry
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bo124rs(at)hotmail.com
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| Posted: Tue Jul 04, 2006 2:43 pm Post subject: Engine alignment |
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Larry and any other listers, what my problem appears to be is a misalignment
of the engine, ie., tilted up with the introduction of the washer between
the engine mount and case on the bottom to clear the lip on the case bottom
attach points. If you notice on the third picture, the gap gets
progressively larger on the bottom of the upper cowl. My thinking is the
washers have canted the engine up, thereby giving me this non standard gap.
Any thoughts?
Dana Overall
Richmond, KY i39
RV-7 slider, Imron black, "Black Magic"
O 360 A1A, C/S C2YK-1BF/F7666A4
http://rvflying.tripod.com/id30.html
do not archive
[quote]From: "LarryRobertHelming" <lhelming(at)sigecom.net>
Reply-To: rv-list(at)matronics.com
To: <rv-list(at)matronics.com>
Subject: Re: Engine alignment
Date: Tue, 4 Jul 2006 16:49:09 -0500
Dana, you want to space it evenly at the front. You do whatever you need
to do to the back to achieve the perfect front. You probably sand/cut
stuff off back there and if you take too much off, you get to add it back
later. You want about 3/8" to 1/4" gap that pic 3 shows to be uniform all
around. Put a spacer in there and clamp it down or it will move when you go
to drilling the cowling to the firewall. You want the cowling to be a bit
low from being perfect to the spinner position so when the engine
drops/sags a bit after a few hours of use, you will be closer to perfect.
Indiana Larry
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lhelming(at)sigecom.net
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| Posted: Tue Jul 04, 2006 4:51 pm Post subject: Engine alignment |
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Dana, you want the engine alignment to be perfect before fitting the
cowling. If it is up or down or anything but straight away, (it is offset
however a bit to the left on mine to alleviate the P-factor I was told) you
will have loss of TAS. Make sure you have the proper engine mount for your
particular engine. Recheck the correct washers were used (top was different
than bottom on mine) on the engine mount. I suspect you will find the
problem is somewhere with the engine mount or attachment. Hope this
helps.
Larry with little SunSeeker -- the Indiana RV7
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rv9jim(at)juno.com
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| Posted: Tue Jul 04, 2006 5:17 pm Post subject: Engine alignment |
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Larry,
I also had a problem with the lower engine mounts flanges where
the rubber engine mounts meet the case. The steel washer of the engine
mount did not meet up flush with the relief cut on the engine case. It
was about 1/8 protrusion at the bottom. I examined the juncture of the
lower oil / intake case with the upper engine case and found out that if
I ground a small amount of the case at the seam between the two parts I
could get the engine mount to lie flush with the upper case mount. The
cut away portion of the flange was between two bolts that held the lower
part of the engine case to the upper part. My die grinder with an
aluminum burr made short work of both sides. My Tech counselor had not
seen this before so it was a new on him. The cut away portion would not
have any effect on the integrity of the case or sealing surface. I could
take a pix if it would be of any help to you.
Jim Nelson
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Mark Phillips in TN
Joined: 10 Jan 2006
Posts: 431
Location: Columbia, TN
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| Posted: Wed Jul 05, 2006 6:22 am Post subject: Engine alignment |
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In a message dated 07/04/2006 7:07:09 PM Central Daylight Time, bo124rs(at)hotmail.com writes:
| Quote: | So, when I placed the upper cowling in place, there is an increasing gap
from top to bottom. Me thinks this does not look right!! |
>>>>>
Hi Dana- Can't really say about the mounts, but looking at the picture of the cowl/spinner fit, from what I've seen (my own and quite a few others) this is a standard fit from Vans. Not hard to fix- if interested holler at me...
Mark
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