Throttle Questions

17 posts / 0 new
Last post
HowLin's picture
HowLin
Offline
Joined: 1/12/12
Posts: 355
Throttle Questions

Took the 'new to us' boat out for a week shakedown cruise in the Gulf Islands before the 5 weeks summer hiatus up the northern BC coast and found almost everything worked good to fantastic. So glad we decided on the 36 mkII! ... and So much bigger than our old Newport 30...

I have two questions regarding the throttle and small "issues" - (M35BC).
1.) I prefer to cruise at about 2100 or 2200 rpm, but for some reason the throttle always wants to slowly spring back down to 1800 rpm. When the engine warms up a while, maybe 2 hrs running; it might only spring back to 2000 rpm; but I can't get it to stay higher without tying it down, which feels kind of dangerous.
Any answers to this issue??

2.) Throttle idle seems to be about 900 when engine cold (which I think is pretty good - to not produce too much vibration - but when the engine is warmed up it only seems to want to idle as low as 1000, which really causes a "CLUNK" when going in and out of gear.
Any answers to this issue??

Thanks;
Howard

---- Howard & Linda Matwick ----

--- S/V "Silhouette" - Nanaimo, BC ----

--- 1999  C36 MkII  #1776 M35BC ---

LCBrandt's picture
LCBrandt
Offline
Joined: 6/26/07
Posts: 1282

I made a velcro 'fix' for the throttle and unashamedly use it. Apparently the friction in the throttle cable can be adjusted at the engine, but five or six years ago I came up with this simple idea and have used it ever since. Note to self: take a photo of this someday and share it.

Yes, the M35 wants to idle about 1000. Check the Technical library, as I seem to recall that there was a bulletin on this. Also, do a search on the forum for past discussion. But FIRST make sure that the rpm you see on your tach is accurate. Get an optical tach and calibrate your tachometer. Easy to do, and a it's low cost instrument to buy at places like Frys or Harbor Freight.

Larry Brandt
S/V High Flight #2109
Pacific Northwest, PDX-based
2002 C-36 mkII SR/FK M35B
 

Steve Frost's picture
Steve Frost
Offline
Joined: 12/14/07
Posts: 788

If you remove the compass from the binical you will find a friction adjustment screw on the throttle arm. At least that is the case on the MKI boats. I finally adjusted mine after my little bungee cord stretched out that I had used like Larry's Velcro.

Cepheus dream
C36 MK I # 825
MK I Tech Editor No Mas

Ciscocat's picture
Ciscocat
Offline
Joined: 6/25/07
Posts: 244

I'll preface this by saying that i have a Mark I so the linkage maybe different, but i got this suggestion from Tom Soko (kudos!) but what he suggested is that you use a small U clamp just aft of the throttle linkage on the engine to put pressure on the exterior of the cable so that when you set the throttle the engine maintains that rpm because of the friction on the cable. the suggestion works great! you don't need a lot of pressure just enough. there may be an article somewhere about it. it doesn't require that you remove the compass and it is a very simple fix. I have had my throttle set that was for at least a couple of years and it works great!
good luck on whatever you try and good sailing!

Mike Hogan
s/v Ciscocat #226
Mark I XP25, std rig

Steve Frost's picture
Steve Frost
Offline
Joined: 12/14/07
Posts: 788

The compass comes off by removing three screws, just one screw to turn inside on the throttle pivot, very easy.

A clamp will work, but there is already a means to correct the issue.

Cepheus dream
C36 MK I # 825
MK I Tech Editor No Mas

LCBrandt's picture
LCBrandt
Offline
Joined: 6/26/07
Posts: 1282

This is a laugh! Both of your C36IA technical 'experts' have been happily using work arounds (Steve's bungee, my velcro) when all along there was a friction adjustment lurking out of view, just inches away from us, and it's reasonably accessible to boot. Steve, thank you for 'fessing up.

I found the Edson manual buried among our many 'How I Done It' articles in the Technical - Maintenance library and I have moved it to the Technical - Reference library, its logical home. Sure enough, there is a description and a drawing of the friction adjustment in the Edson document.

It's a pleasure to have a paradigm exploded every once in a while.

Larry Brandt
S/V High Flight #2109
Pacific Northwest, PDX-based
2002 C-36 mkII SR/FK M35B
 

HowLin's picture
HowLin
Offline
Joined: 1/12/12
Posts: 355

Awesome! That is why this forum is so helpful - even some of you 'old dogs' on the forum still get useful info.. haha :D
Anyway; I'll be down on the boat this afternoon "fixing" that.

Now; how about that annoying idle change? ;)

---- Howard & Linda Matwick ----

--- S/V "Silhouette" - Nanaimo, BC ----

--- 1999  C36 MkII  #1776 M35BC ---

LCBrandt's picture
LCBrandt
Offline
Joined: 6/26/07
Posts: 1282

More important is validating your tach accuracy before you even attempt to troubleshoot any idle rpm issues. The M35 wants to idle high, as it will be smoother. But how high cannot be answered until you have a tach you can trust.

Larry Brandt
S/V High Flight #2109
Pacific Northwest, PDX-based
2002 C-36 mkII SR/FK M35B
 

HowLin's picture
HowLin
Offline
Joined: 1/12/12
Posts: 355

True and agreed Larry, but it still doesn't negate the point that the lowest idle rpm increases over 100 rpm once the engine is at temp...
I definitely will check the tach, as it has a bearing on all (including my preferred cruising rpm)...
I guess can always lower the idle; but then I'll get the dreaded 'shakes' (800-900rpm) when starting and running til up to temp...
Maybe I'll get lucky and the throttle friction adjust will fix it! :)

Cheers,

---- Howard & Linda Matwick ----

--- S/V "Silhouette" - Nanaimo, BC ----

--- 1999  C36 MkII  #1776 M35BC ---

hilbre
Offline
Joined: 7/19/08
Posts: 218

You may also want to check that the fuel lines are fully bled and the fuel pump filter is clean.
John Meyer

John Meyer
Hilbre
C36 MKll, Hull 2135

Cabrillo Marina, San Pedro, CA

stu jackson c34's picture
stu jackson c34
Offline
Joined: 12/3/08
Posts: 1270

The Hurth transmission manual suggests that you move into gear "assertively" (or some such word!). It also says it's good at up to 1200 rpm. Check that manual, too, 'cuz lots of people try to "slip" it into gear rather than moving the lever quickly.

Stu Jackson, C34IA Secretary, C34 #224, 1986, SR/FK, M25 engine, Rocna 10 (22#)

John Lastovica
Offline
Joined: 6/23/10
Posts: 17

[QUOTE=LCBrandt;13109]This is a laugh! Both of your C36IA technical 'experts' have been happily using work arounds (Steve's bungee, my velcro) when all along there was a friction adjustment lurking out of view, just inches away from us, and it's reasonably accessible to boot. Steve, thank you for 'fessing up.

I found the Edson manual buried among our many 'How I Done It' articles in the Technical - Maintenance library and I have moved it to the Technical - Reference library, its logical home. Sure enough, there is a description and a drawing of the friction adjustment in the Edson document.

It's a pleasure to have a paradigm exploded every once in a while.[/QUOTE]

What a great source of information! Now that the friction problem is solved, can anyone help me find a replacement throttle lever -the one we use right by the compass? I broke it in half during my launch this year, (maybe less friction will help prevent that in the future) and have looked hard on the internet in all the usual places and can't find a replacement!

John & Tina Lastovica
"Airborne"
1988 Catalina 36 Hull No. 865
Lake Huron

plaineolde's picture
plaineolde
Offline
Joined: 11/4/08
Posts: 753

try Catalina Direct, I think they have 'em.

catalinadirect.com

Gary and Cathy Price
1997 C36 Mk II Tall Rig/Wing Keel Imagine...
Hull # 1617
Worton Creek, Md.
Northern Chesapeake Bay

TomSoko's picture
TomSoko
Offline
Joined: 2/15/07
Posts: 978

John,
Don't bother with a plastic replacement handle. It is a poor design and will only break again. I'd suggest biting the bullet and get the SS version, which is what has been OEM for the past 10-15+ years:
[URL]http://www.defender.com/product.jsp?path=-1|118|297677|297706&id=79690[/URL]
Edson also mades a matching shift handle for the port side.

Tom Sokoloski
C36/375IA Past Commodore
Noank, CT

John Lastovica
Offline
Joined: 6/23/10
Posts: 17

[QUOTE=TomSoko;13145]John,
Don't bother with a plastic replacement handle. It is a poor design and will only break again. I'd suggest biting the bullet and get the SS version, which is what has been OEM for the past 10-15+ years:
[URL]http://www.defender.com/product.jsp?path=-1|118|297677|297706&id=79690[/URL]
Edson also mades a matching shift handle for the port side.[/QUOTE]

Thank you! I'm buying the SS version, today. The help is greatly appreciated. Next time, I think I'll ask here first before spending hours on the internet searching in vain. ( I was just about ready to have a machine shop try to fab up a throttle handle for me)

John & Tina Lastovica
"Airborne"
1988 Catalina 36 Hull No. 865
Lake Huron

feigersailing
Offline
Joined: 8/21/12
Posts: 17

By chance would anyone know the thread type for the throttle friction screw? Mine is missing, I suppose some weekend I will take a smattering of screws down and try them. But if anyone knows off the top of their head that would be great.

Cheers.

Fred & Cathy
Black Magic
1984 Catalina 36 Tall
Hull #315
Traverse City, MI

Steve Frost's picture
Steve Frost
Offline
Joined: 12/14/07
Posts: 788

I do not know for sure but, it was a fairly large screw corse thread scew, 10/20 or maybe 1/4 20.

Cepheus dream
C36 MK I # 825
MK I Tech Editor No Mas

Log in or register to post comments