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David Wilson

Member
I am installing engine in a RV9A but I don't like the position of the fuel pump because any fuel leaks in the pump will be blown on to the cylinders and or exhaust.

Have any other H2AD users come up with a solution and is it possible to drive a pump of the vacuum pump drive?

David Wilson
UK
 
H2AD fuel pumps

My H engine in my 6A has performed well. I did run the small drain hose down to the lower rear of the bottom cowl in case the diaphragm had a leak. I fire sleeved all hoses except the drain.
 
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I don't think the 172 used a mech fuel pump. Gravity fed fuel?

Alternatively, you could use 2 electric fuel pumps.
 
I ran fire sleeved fuel hoses over the top of the crankcase on my "H" engined -6 with AC fuel pump fitted. No problems so far in 200hrs, summer or winter. I did as Vern did and ran the drain pipe down through the forward baffle floor and out of the rear of the cowling away from the exhaust.

Graham in Aus
RV6 H2AD 200hrs
 
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DITTO

airtractor8 said:
I ran fire sleeved fuel hoses over the top of the crankcase on my "H" engined -6 with AC fuel pump fitted. No problems so far in 200hrs, summer or winter. I did as Vern did and ran the drain pipe down through the forward baffle floor and out of the rear of the cowling away from the exhaust.

Graham in Aus
RV6 H2AD 200hrs
Click to expand...

I did the same with no problems now for 650 hours.
 
This design has an up side

David Wilson said:
I am installing engine in a RV9A but I don't like the position of the fuel pump because any fuel leaks in the pump will be blown on to the cylinders and or exhaust.

Have any other H2AD users come up with a solution and is it possible to drive a pump of the vacuum pump drive?

David Wilson
UK
Click to expand...

David,
The advantage of this location is that it will not be subject to heating of the pump. This location [on the upper/forward crankcase] will ensure that the incoming air keeps your fuel pump (and the fuel inside of it) cool. So long as you are diligent in routing an overflow hose from the pump and follow the advice of the other listers, it should work well. The rear mounted fuel pumps need this hose, too. Without it, the rear located pumps drip fuel [after a diaphragm failure] onto the exhaust.
The accessory cover mounted fuel pumps tend to get hot. Most certified aircraft install a shroud and blast tube in an attempt to keep them cool.
Charlie Kuss
 
Lionclaw said:
http://www.vansairforce.com/community/showthread.php?t=8184&highlight=romec&page=3

Helio tried it, although his last post says the pump drive shaft broke. Maybe he could provide some more insight.

After reading his post about the shaft breaking I decided to just go with the AC pump on my H2AD.
Click to expand...

yes, I have it and I am flying for about 10 hours.
however all my flight could be more relaxed.
I can't take my eyes off the fuel pressure gauge without look at a safe place to emergency landing (lol).
to be honest, if I had a new fuel pump, It would be better.

so, I would like to buy the correct camshaft for my H2AD, and I?m not sure which is the correct part number.
Anyone could help me?
Where can I find it? new or used in good conditions?

Thank you in advance.
helio
brazil


ps
My camshaft seem not the correct one, because i has not plunger>
http://www.ppxdf.com/h2ad/image_1.jpg
http://www.ppxdf.com/h2ad/image_2.jpg
http://www.ppxdf.com/h2ad/image_3.jpg
http://www.ppxdf.com/h2ad/image_4.jpg
http://www.ppxdf.com/h2ad/image_5.jpg
http://www.ppxdf.com/h2ad/image_6.jpg
 
Helio, the cam will depend on whether or not your engine has the t-mod. The t-mod engines have larger diameter lifters and larger cam lobes.

If your serial number has a "T" at the end it is a t-mod engine. If it isn't a t-mod engine you may be able to get a roller cam kit for it.

It looks like there's an older non t-mod cam on ebay right now (not mine).

My engine has the t-mod, and my cam's yellow tag shows the PN is LW-16510R.
 
Lionclaw said:
Helio, the cam will depend on whether or not your engine has the t-mod. The t-mod engines have larger diameter lifters and larger cam lobes.

If your serial number has a "T" at the end it is a t-mod engine. If it isn't a t-mod engine you may be able to get a roller cam kit for it.

It looks like there's an older non t-mod cam on ebay right now (not mine).

My engine has the t-mod, and my cam's yellow tag shows the PN is LW-16510R.
Click to expand...

Great Andy !!!!!!!!
You were perfect. Thank you very much
my O320-H2AD has this serial: L-8296-76T
I understood this "76T" means I have a T-mod engine, right?
Maybe I dont have the correct PART CATALOG as well, because
I cant find this PN (LW-16510R) there.
I have this part catalog revision PC-122-1 publication O-320-H 76 series.
http://www.ppxdf.com/lyc_pc-122.pdf
Do you use a different one?
I am a little confuse man, and I am afraid to buy a wrong camshaft or a like I have.

Thanks again for help me.
Helio

PS

please check here at page 8 item 10
http://www.ppxdf.com/lyc_pc-122.pdf
LW-16512 CAMSHAFT, GEAR & TACHOMETER SHAFT ASSY
 
H2AD new cam is lw-16511

At least as of 11/2008, lw-16511 was the correct pn for a H2AD T mod cam. I bought one. Matched dimensionally with the bad cam I took out(Lyc installed, 2442TT), and has the fuel pump lobe. It also has the gear pin installed. Brace yourself: $816.64 new from airsuppliers.com (genuine Lycoming). Going with a clone was only going to save about $15.

Oddly the aircraft my engine came out of had had 2 pre-purchase inspections both PASSING the cam. That it was bad was obvious to me with a flashlight looking into the assembled engine. One lobe had a fingernail shaped chunk missing. Another lobe shed the same by scratching my fingernail over it.

Rick 90432
 
PC 122-1 is the current parts catalog

ppxdf said:
snipped
Maybe I dont have the correct PART CATALOG as well, because
I cant find this PN (LW-16510R) there.
I have this part catalog revision PC-122-1 publication O-320-H 76 series.
http://www.ppxdf.com/lyc_pc-122.pdf
Do you use a different one?
I am a little confuse man, and I am afraid to buy a wrong camshaft or a like I have.
snipped
Click to expand...

Helio,
Service Letter L114AR spells out all the technical manual and parts catalog publications for Lycoming. It also tells what the current revision of each document is. On page 3, it lists your parts catalog [revision 1] as being current. The -1 at the end of the Catalog number [PC-122] is the revision number. That parts catalog has not been updated since December 1980.

You can download SL L114AR here:

http://www.lycoming.com/support/publications/service-letters/pdfs/SL114AR.PDF

Supplement 1 to SL L114AR can be downloaded here:

http://www.lycoming.com/support/publications/service-letters/pdfs/SL114AR-S1.pdf

This is a VERY handy document for any Lycoming owner to have.

I'm sure that the T Mod info is contained in a Service Bulletin(s) or Service Instruction(s). I'll have to do some research to try and find that info. Perhaps Andy can direct you to it???
Charlie Kuss
 
Charlie has sparked my interest on this again, and I'm trying to find documentation for the t-mod now. So far what I know of the t-mod has come from online resources and also talking to engine builders. I'll post back if I can figure out which SI or SB covers the mod.

New cam: (lw-16511)
lw16511.jpg


Old cam: (lw-16003)
lw16003.jpg


(these pics are from auction listings, and I'll gladly remove them if whoever owns them doesn't want me to reference them)

I believe (and I could be wrong!) that PN LW-16511 is an assembly consisting of cam LW-16510 and pin STD-1066.
 
AD 80-04-03

Helio and Andy,
AD 80-04-03 gives an over view of the O-320-H and O-360-E series lifter and camshaft issues. You can read it here:

http://www.yeeles.com/Reference/AD/Lycoming/80-04-03.pdf

Service Bulletin SB 435 and Service Instruction SI 1406B give the details. The correct part numbers for the updated parts are in SI 1406B. I will email a copy of SI 1406B to both Helio and Andy. Anyone else who would like a copy, contact me by email, off list.
This AD also mentions SB 446B. It has been updated and can be found below.

http://www.lycoming.textron.com/support/publications/service-bulletins/pdfs/SB446E.pdf

I can not find my copy of SB 435. If anyone can provide this, I would appreciate it.

There is a history of the camshaft/lifter saga of these engines which can be found below.

http://egaa.home.mindspring.com/engine5.htm

Charlie Kuss
 
??

We all seem to be in violent agreement at this point . . . the current manual and service bulletins is a good thing, the lowest level PN you can currently buy from Lycoming for a t-mod cam is LW-16511, which is cam + pin, blah, blah. What are we still researching?

Charlie, I've got all my data on my work pc, I'll send you a note on sb435.

Rick 90432
 
Check PMs

ppxdf said:
yes, I have it and I am flying for about 10 hours.
however all my flight could be more relaxed.
I can't take my eyes off the fuel pressure gauge without look at a safe place to emergency landing (lol).
to be honest, if I had a new fuel pump, It would be better.

so, I would like to buy the correct camshaft for my H2AD, and I?m not sure which is the correct part number.
Anyone could help me?
Where can I find it? new or used in good conditions?

Thank you in advance.
helio
brazil
snipped
Click to expand...

Helio,
Please check your private messages. I need your email address so that I can send you the info you need.
Charlie Kuss
 
rjcthree said:
At least as of 11/2008, lw-16511 was the correct pn for a H2AD T mod cam. I bought one. Matched dimensionally with the bad cam I took out(Lyc installed, 2442TT), and has the fuel pump lobe. It also has the gear pin installed. Brace yourself: $816.64 new from airsuppliers.com (genuine Lycoming). Going with a clone was only going to save about $15.

Oddly the aircraft my engine came out of had had 2 pre-purchase inspections both PASSING the cam. That it was bad was obvious to me with a flashlight looking into the assembled engine. One lobe had a fingernail shaped chunk missing. Another lobe shed the same by scratching my fingernail over it.

Rick 90432
Click to expand...

Thanks Rick
I emailed and phoned call them,
They said they dont accept international credicard or paypal. (just bank transfer)
As I live in Brazil, it is quite difficult.
I also need the pn for the gasket set ( if you have it please post here, my friend)
Anyone could suggest another place that I could buy my Camshaft and
the gasket set?

have you a good day!!!!

helio.

ps:
I have a ship address in Miami.
so, it wont be a worldwide ship.
 
Thanks Guys for your help regarding the H2AD fuel pump. One thing I should have mentioned in my original post is that the engine came with an Ellison Carb and the instructions for that is the must not be any high spots in fuel lines because of vapour locking which proclude running lines over the top of the cylinders. Has anyone fitted an ellison carb on a h2ad in an RV? The engine came out of a One Design and has 30 hours since rebuild to latest spec. with all mods complete.

David Wilson
 
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