WH-13 Carbs interchangeable? Rebuild Update

[Coloradolakeboy]

I have a 1980 Merc 175 V-6 Serial #5541133 with WH-13 carbs. Are any other WH carbs interchangable? Thanks.

 

[Coloradolakeboy]

Re: WH-13 Carbs interchangeable?

Re: WH-13 Carbs interchangeable?

If a diiferent carb still uses the same rebuild kit #, is that a conclusive indication of compatibility?

 

[Coloradolakeboy]

Re: WH-13 Carbs interchangeable?

Re: WH-13 Carbs interchangeable?

A local mechanic looked online today and told me WH-28, Wh-39 and Wh-46
might work, be he didn't seem too sure.

 

[achris]

Re: WH-13 Carbs interchangeable?

Re: WH-13 Carbs interchangeable?

You will probably need to change all 3 carbs....

 

[Coloradolakeboy]

Re: WH-13 Carbs interchangeable?

Re: WH-13 Carbs interchangeable?

You will probably need to change all 3 carbs....

Thanks, but what WH is compatible?

 

[Faztbullet]

Re: WH-13 Carbs interchangeable?

Re: WH-13 Carbs interchangeable?

What are you trying to do as that is the 2.0 liter 175 and it putting out all the hp it can now?

 

[Coloradolakeboy]

Re: WH-13 Carbs interchangeable?

Re: WH-13 Carbs interchangeable?

What are you trying to do as that is the 2.0 liter 175 and it putting out all the hp it can now?

I just want to get an extra set (all three) of carbs to rebuild before I take off mine. We have a pretty short boating window at this altitude. Thanks for all of your help. My Merc manual should be showing up today.

 

[Coloradolakeboy]

Re: WH-Carbs interchangeable?

Re: WH-Carbs interchangeable?

Finally, I got the Merc Service Manual today. The lower the WH #, the older the carb. So my WH-13 carbs are pretty old. It does not list compatibility for a swap out. Here's what I'm trying to do... I would like to get a three pack of carbs to rebuild while I use the factory installed WH-13's. If I have a failure on the rebuilds, I can put the Wh-13's back on to use the boat during our short high altitude season. I just cannot find any information regarding the spec changes in the various WH carbs.

 

[j_martin]

Re: WH-Carbs interchangeable?

Re: WH-Carbs interchangeable?

Finally, I got the Merc Service Manual today. The lower the WH #, the older the carb. So my WH-13 carbs are pretty old. It does not list compatibility for a swap out. Here's what I'm trying to do... I would like to get a three pack of carbs to rebuild while I use the factory installed WH-13's. If I have a failure on the rebuilds, I can put the Wh-13's back on to use the boat during our short high altitude season. I just cannot find any information regarding the spec changes in the various WH carbs.

The guy that has set up, and blown up more 2.0 carbed motors than I can count on fingers and toes, and considered the GURU, is T-rex. He can be found on screamandfly.com or byuboyz.com

Carburetor setup is always a tradeoff between the good(runs), the bad (bogs), and the ugly(burns down).

hope it helps
John

 

[Dukedog]

Re: WH-13 Carbs interchangeable?

Re: WH-13 Carbs interchangeable?

All wh's use tha same basic kits. What you might run in to buy buying another set (carbs) is tha jetting for your high altitude. Its not a very time consuming or difficult deal to do your carbs. 99% cleaning and new gaskets is all you usually need do to 'em............JMO

BTW, tha difference in tha kits will be tha carb ta reed plate gasket. Vertical (yours) and horizontal (different from yours) Kit may/may not have both....

 

[Faztbullet]

Re: WH-13 Carbs interchangeable?

Re: WH-13 Carbs interchangeable?

Wh-17 & 28's will work....

 

[Coloradolakeboy]

Re: WH-13 Carbs interchangeable?

Re: WH-13 Carbs interchangeable?

Thanks to all for the help and great info. Today I found the gasket kits and needle/seat kits locally. Hope they have a fuel pump kit as well. I could not find floats though, hope I don't need any.

Faztbullet, thanks for the advise on the Wh-17 & 28's being interchangeable.

I know these carbs are a simple design and I have rebuilt two barrel auto carbs before. Although it's been quite a while. I'm just worried I'll break something and put the boat of commission.

The shop tech I spoke with said they typically do not change the jets, even at the 5000 ft we are at. But they did have what I need in stock

 

[achris]

Re: WH-13 Carbs interchangeable?

Re: WH-13 Carbs interchangeable?

If you have done auto 2 barrels, then you'll do these with your eyes shut. Very simple carb in design, easy to strip and clean, and difficult to break....

About jetting for altitude... My Merc service manual says 2500'-5000' should have 0.002" smaller than standard on all jets (Main, vent, idle) and 5000'-7500' should be 0.004" smaller than standard on all jets. I guess that just means leaving them standard will have you running richer, not necessarily a bad thing....

Have fun...

Chris..........

 

[Coloradolakeboy]

Re: WH-13 Carbs interchangeable?

Re: WH-13 Carbs interchangeable?

If you have done auto 2 barrels, then you'll do these with your eyes shut. Very simple carb in design, easy to strip and clean, and difficult to break....

About jetting for altitude... My Merc service manual says 2500'-5000' should have 0.002" smaller than standard on all jets (Main, vent, idle) and 5000'-7500' should be 0.004" smaller than standard on all jets. I guess that just means leaving them standard will have you running richer, not necessarily a bad thing....

Have fun...

Chris..........

Chris, thanks for the vote of confidence! It just ocurred to me that the marina probably does not want to change jets on boats they service.
My book shows for 5000 ft .004 smaller on Main and Vent and .004 larger on Idle. Joe weekend boater has the marina change the jets for altitude and THEN decides to take his Boat to a lower elevation pond like Lake Powell. Due to the lean setting, the marina could lose a good customer...

I understand the difference and may change them anyway after the rebuilds.

 

[86 century]

Re: WH-13 Carbs interchangeable?

Re: WH-13 Carbs interchangeable?

My big merc runs rich so I just keep a spare set of plugs with me(easier to change than a piston)Good luck

 

[Dsilvers112]

Re: WH-13 Carbs interchangeable?

Re: WH-13 Carbs interchangeable?

im new to iboats forum. anyone know why when i try to create a new post i get this message: Dsilvers112, you do not have permission to access this page. This could be due to one of several reasons:

Your user account may not have sufficient privileges to access this page. Are you trying to edit someone else's post, access administrative features or some other privileged system?
If you are trying to post, the administrator may have disabled your account, or it may be awaiting activation.

 

[sschefer]

Re: WH-13 Carbs interchangeable?

Re: WH-13 Carbs interchangeable?

There's a couple of ways around changing jets at high altitude. I never do it either. I drop 2" of prop pitch and run regular gas instead of super. I just came back from a high desert fishing trip and my rpms were down 400 but my top speed stayed about the same. Gotta love thin air

Regarding your floats. There's two per carb and they are no longer available through merc. Even if you don't need them now, if you find them, buy them. I expect that GLM will probably pick up the ball here at some point and start offering them. V6 Rod Bearings went the same route but GLM picked them up. You might be able to get them through www.promarineusa.com.. The website has been down for a while and now their phones are messed up so I'm not sure what their future is but if you go to the link above you can download their catalog and call the order in or email it.

 

[achris]

Re: WH-13 Carbs interchangeable?

Re: WH-13 Carbs interchangeable?

...My book shows for 5000 ft .004 smaller on Main and Vent and .004 larger on Idle.....

Quite right... I've been reading too many manuals and now the wordsjustallblendintogether...

 

[Coloradolakeboy]

Re: WH-13 Carbs interchangeable?

Re: WH-13 Carbs interchangeable?

There's a couple of ways around changing jets at high altitude. I never do it either. I drop 2" of prop pitch and run regular gas instead of super. I just came back from a high desert fishing trip and my rpms were down 400 but my top speed stayed about the same. Gotta love thin air

Regarding your floats. There's two per carb and they are no longer available through merc. Even if you don't need them now, if you find them, buy them. I expect that GLM will probably pick up the ball here at some point and start offering them. V6 Rod Bearings went the same route but GLM picked them up. You might be able to get them through www.promarineusa.com.. The website has been down for a while and now their phones are messed up so I'm not sure what their future is but if you go to the link above you can download their catalog and call the order in or email it.

Thanks sschefer, I clicked on your provided link and they do show a 1395-9293 and a 1395-9594 float I think I need a 1395-9267 for my WH-13's. Not sure if what they have is interchangeable. Sounds like they got behind on their phone bill and got cut-off, not a good sign. Thanks for your help.
Rob

 

[j_martin]

Re: WH-13 Carbs interchangeable?

Re: WH-13 Carbs interchangeable?

I think all the WH floats are the same. Early ones were foam and they all sunk when ethanol got in the fuel. The replacements, and stock since mid 80's are a hard plastic, and they are almost bullet proof. Buy a set of junk off a late 80's 135 on eBay for the floats. The different numbers are probably foam or plastic.

GLM has had the part number in it's catalog for years, with no product.

Changing jets for altitude is about a 15 minute job, especially if you have a set of carriers from the same junk carbs you bought for floats. Performance difference is significant.

my 02
John