Serious? Not serious? Lend me your ears. 6v92 throttle and top speed

neoneddy · October 01, 2017, 10:49:07 AM

So, this morning we finished up a hockey tournament here in Blaine ,MN and it was time to take the bus home.

Was 50ish degrees out, I started it up and it smoked like usual until it game up to temp (sat for 3 days). It wasn't until I left the parking lot that the exhaust was completely clear. Engine temp was around 140-150 .

This is all normal still I think.

Now ever since I got the bus this spring the throttle has been stiff. It's been nice while cruising because with the eight of my foot on it she'll cruise at 63-65 perfectly.

Now what worried me

I couldn't get it to go much past 62mph no matter how much throttle I have it. It always felt like 3/4 pedal the whole 7-10 mile drive home. Acceleration from a stop seemed great still.

I'm wondering if it's possible I have binding in my throttle cable . Is that something that can go out of adjustment? The second factor for looking into this is I never get black smoke ever (more fuel than it can burn).

Any ideas?

God I hope my engine isn't having issues.

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gumpy · October 01, 2017, 11:17:14 AM

I would lubricate the throttle pivot points and check the air cleaner and fuel filters.

chessie4905 · October 01, 2017, 11:20:38 AM

Make sure your fuel filters don't need changed. They can creep up on you.

neoneddy · October 01, 2017, 11:24:31 AM

Just did fuel filters within 200 miles.

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neoneddy · October 01, 2017, 11:33:13 AM

Quote from: gumpy on October 01, 2017, 11:17:14 AM
I would lubricate the throttle pivot points and check the air cleaner and fuel filters.

Yeah I've been meaning to tackle the air cleaner. Who knows when that was last done.

Any tips on tackling that or can I just stop by :-)

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gumpy · October 01, 2017, 11:40:19 AM

Quote from: neoneddy on October 01, 2017, 11:33:13 AM
Yeah I've been meaning to tackle the air cleaner. Who knows when that was last done.

Any tips on tackling that or can I just stop by :-)

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It's a pain in the butt to get it out and moreso to get it back in. You're welcome to get the element from JD and bring your bus by and I'll help you change it. It'll take about 30 minutes. BTW, I want your old filter element if you're just going to throw it away. I'll trade you my time to help change it for the old element.

luvrbus · October 01, 2017, 12:43:55 PM

Check the linkage have some one push the pedal and be sure it is opening all the way,then be sure the shut down cylinder is retracting all the way back,no black smoke either the fuel filter or the shut down cylinder is not fully retracting would be my WAG if you have a mechanical engine

bevans6 · October 01, 2017, 12:49:43 PM

My throttle cable (MC-5C so about the same as yours) had frayed inside the flexible rubber cover and was almost seized. I only discovered it when I was changing my engine, I didn't look for it. The rubber cover is a kind of bellows affair at the end of the cable. Changing the cable was a stone bitch, it was very hard for a number of reasons that since I now know them I can tell you...

Fred Mc · October 01, 2017, 12:50:24 PM

When I first got my bus had the same problem.Turns out there was rag in the fuel tank blocking the pickup.

brmax · October 01, 2017, 01:30:12 PM

Maybe Your usage also.
I use to re-use the big filters and it worked great, i no longer have a big parts washer sitting on the barrel. But having one of these big long filters sitting on a brick or two in the barrel and able to strain the parts fluid is a great option.

Floyd

neoneddy · October 01, 2017, 02:37:51 PM

Update: had the lady come and stomp on the pedal up front and I'd say there is a good 1-2 inches of travel still available that the pedal wouldn't do.

Next I climbed in the spare tire bay to find a bent throttle linkage rod or something.

It's going to be hard to resist straightening it out before I hear a reply from the experts, no promises.

Next I also found this monstrosity on the other side of the throttle. Anything to be concerned with? What's it do?

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eagle19952 · October 01, 2017, 03:05:24 PM

someone spliced a broken cable....

luvrbus · October 01, 2017, 03:11:06 PM

What a mess almost looks like a Eagle with all the rust,a air throttle could be your best bet on that bus

neoneddy · October 01, 2017, 03:35:40 PM

Just got back from a test drive after bending the throttle linkage back and giving all the moving parts a shot of wd40 and then lithium grease.

I've got good news and bad news to report. Good news is I think this was the issue, after straightening the linkage there was maybe ½ inch of throttle movement left at the engine. Wow the power, I doubt many people have said that about a 6v92 in a bus but it felt like a major upgrade.

She went right up to 70 and wanted to keep going on flat land. I'm wondering if maybe it was bent as a poor man's governor by the previous transit company.

So what's the bad news? Other than more rust for me to worry about I fear my 8mpg trips might be in the rear view mirror. I still never saw any black smoke but in the end she's got way more power then I even felt when it was a gutted shell.

The broken cable just went to a sensor. Best I can tell throttle position, I don't think my 82 mc9 has any Computer smarts on it.

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TomC · October 02, 2017, 06:30:59 AM

Time to change to air throttle.