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806 fuel pump

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Bob M.

12-05-2007 19:42:25

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I have the 806 diesel with a Roosamaster injection pump. I have a leak on the block side of the pump. there is a small tube with a fitting there. It's difficult to see just what it is. I think I"ll have to take off the pump to fix it.

The question is what do I need to be careful of as far as timing when I take the pump off and if I get it messed up how do I reset the timing.

Thanks a lot,

Really appreciate the help,

Bob

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Bob M.

12-12-2007 17:38:59

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Re: 806 fuel pump in reply to Bob M., 12-05-2007 19:42:25

Well, I got this thing apart and the line I thought would be leaking isn't the problem. All I can figure is the throttle shaft O ring shrinks with cold weather and it leaks there. The entire back of the pump is wet so it all looks the same.

Thanks again,

Bob

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Bob M.

12-06-2007 10:17:29

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Re: 806 fuel pump in reply to Bob M., 12-05-2007 19:42:25

I have to use my old 806 for the snow stuff down here. We're getting it right now in Iowa. We've had a good dose of ice,snow, then more ice/snow.

I guess this is winter.

Thanks again Bob

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ChrisAS

12-06-2007 08:28:35

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Re: 806 fuel pump in reply to Bob M., 12-05-2007 19:42:25

the seals are not o Ring they u cups one facing the pump to seal fuel from the engine and one facing dorward to hold engine oil from pump. The one facing the pump can be rolled over very easy and cause fuel lead.

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Hugh MacKay

12-06-2007 02:50:27

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Re: 806 fuel pump in reply to Bob M., 12-05-2007 19:42:25

Bob: Hard to imagine you with a timing problem. Stick with KB's advice, it's almost service manual quality. Be exceptionally careful with those O rings as you slide the pump back on, lubricate well as he stated. Watch the crankcase levels closely during early hours of operation. If one damages those O rings, usually his first notice is diesel fuel in the crankcase. Been there and done that, plus I knew the warnings in advance.

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K.B.-826

12-05-2007 20:27:46

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Re: 806 fuel pump in reply to Bob M., 12-05-2007 19:42:25

You'll see a small rectangular cover on the side of the pump, held on with two screws. Remove the cover and rotate the engine clockwise until the two timing marks visible inside the pump's timing window line up. Wire the throttle arm in the full throttle position to keep the governor weights in place. Remove the pump and repair as needed, make sure nobody turns the engine while the pump is off. The pump driveshaft will stay with the engine. When you go to reinstall it, line up the marks inside the pump as close as possible, install it over the driveshaft, snug up the pump-to-engine bolts finger tight, then rotate the pump housing as needed to line the marks up perfectly, and tighten the bolts securely. There are two seals on the pump driveshaft, the rear one can be a little tricky to slide the pump over without rolling it if you don't have the special tool, but an o-ring pick will work in a pinch to help get the lips of the seal started. Lube those seals up real good. If you mess it up, it'll leak fuel into the oil pan, so watch to make sure the oil level isn't rising.

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ChrisAS

12-05-2007 20:17:03

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Re: 806 fuel pump in reply to Bob M., 12-05-2007 19:42:25

Bob That pump has a timing plate on the right or out aide with 2 little screws. take it of and you will see 2 disks the back 1 will have a black line on it. On left side of clutch housing you will see a plate with 2 1/4" screws take it of so you can see timing marks on fly wheel. Turn engine to TDC and look at pump to see the front disk has a black line to match back disk if not turn engine one wore time to TDC and check pump again the line should be there. Then you can remove pump. Just don't turn when you have it off.

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Bob M.

12-06-2007 06:59:31

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Re: 806 fuel pump in reply to ChrisAS, 12-05-2007 20:17:03

Thanks a lot to all of you. That was the information I needed to get this thing fixed. Looks like I"ll need it for moving snow.

Appreciate it,

Have a great Christmas

Bob

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Hugh MacKay

12-06-2007 08:13:15

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Re: 806 fuel pump in reply to Bob M., 12-06-2007 06:59:31

Bob: Are you telling us the trustworthy old Super M is no longer on snow duty? Didn't you know, Mike Soldan is restricting snow movement across Southern Ontario this winter? You guys east of Buffalo may not even get enough to go toboganing.

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Owen Aaland

12-06-2007 12:44:42

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Re: 806 fuel pump in reply to Hugh MacKay, 12-06-2007 08:13:15

The leak you have is from the recirculation tube. The solution is to remove the hose. You will need a new timing plate to replace the one with the nipple and either a new inlet fitting or just braze the nipple closed. Do not put the hose back on the pump.

The recirculation system was to extend the life of the filters by returning less fuel to the tank via the return line. The problem is that by not returning all the excess fuel to the tank, the pump will run hotter and this can lead to starting problems when the engine is hot. There was a service bulletin to remove the system issued sometime in the late sixty's or early seventy's. It has been a long time since I have seen an 806 that still had it installed.

The injection pump shaft seals on the 806 are not the lip style seals on the shaft as used on the 560 but rather two normal looking oil seals in the adapter housing. These seals are not disturbed by removing the pump. There is an O-ring to seal the housing to the adapter housing.

If you scribe a mark across the pump housing and adapter you can reassemble everything and not have to worry about getting it out of time. Just don't rotate the engine or pump while you have them off.

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Bob M.

12-06-2007 13:29:29

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Re: 806 fuel pump in reply to Owen Aaland, 12-06-2007 12:44:42

Thanks for the additional information, Owen. I don't have the other plate. If I work with what I have, can I just tighten the fitting on the block side of the pump or is there something else I have to consider?

I appreciate all the help from the forum.

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Bob M.

12-06-2007 13:34:34

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Re: 806 fuel pump in reply to Bob M., 12-06-2007 13:29:29

I'm going to tear this apart tomorrow. We're supposed to keep getting more winter here.

I'll post back with how it came out.

Thanks again

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