Riello RDB2 Burner Problems

[dobbslc]

That's the same filter mine takes and it looks the same as yours.

 

[Onoff]

That's the same filter mine takes and it looks the same as yours.

Fingers crossed. That place I got them from had processed and shipped them before I'd emailed querying the "shallow" issue.

 

[dobbslc]

What's the shallow issue?

 

[julianf]

I have two burners here. One is acting up. I just bought a new pump off ebay for £70 delivered. If i can then fix the old pump ill do that, but i figured id throw money at it, and then, if the old one was fixable, id have a spare anyway.

 

[Onoff]

What's the shallow issue?

The height of the red canister on the filter. Some apparently longer than others.

 

[Beanwood]

You could always remove the filter and measure it. Whilst it's out - check what state it's in, order a new one - and see if the boiler locks out with it missing?

 

[Onoff]

The saga continued tonight!

Boiler was locking out and I noted again a tight spots(s) when I rotated the fan (under the air intake) by hand.

https://flic.kr/p/2pJs1yE

Took the pump off, 4mm Allen key, 2 black cap screws at the side) and the fan rotated freely. The pump in my hand however felt tight to rotate.

So I grabbed the other pump that just needed a key..or so I thought. That rotated freely.

I put the key I made in the "freely rotating" pump and screwed the "cap" (3 screws, 3mm Allen key)on. It felt tight...???

I had to rub the big "ring" gear I'm pointing to with the Allen key on some emery paper on a flat surface. Burrs maybe? Ditto the small gear the key sits in. Flushed everything out with carb cleaner. (This is pre changing the key):

https://flic.kr/p/2pJtKxG

So key fitted, cap went on without the pump binding when turned. Happy days thought I. Pump turned and you see/feel the gears engaging/turning.

All back together, bled and it fired up but it stop / started then locked out. Couldn't seem to get the pressure up on the gauge either.

So I put the pump that was on there to start with back on. Changed the key over. Rubbed the same two gears on emery. It felt free. Put back on. Tried to fire up and it was sticking again!

Took out the key I made and took a fraction off the height.

Still binding.

Giving up tonight and will anyway order a new pump.

https://flic.kr/p/2pJuk6H

Head frazzled.

 

[Onoff]

I have two burners here. One is acting up. I just bought a new pump off ebay for £70 delivered. If i can then fix the old pump ill do that, but i figured id throw money at it, and then, if the old one was fixable, id have a spare anyway.

Would you have a link to the pump you bought?

 

[julianf]

Would you have a link to the pump you bought?

Riello Pump B10 20030953 Unopened | eBay

Riello Pump B10 20030953

www.ebay.co.uk

It was a 1-off, but i have the part number in my "saved searches" and the price isnt uncommon. Every day price is more like £85 ish, but spend a couple of weeks and £70 will come around.

 

[julianf]

eg

386917310376
276413135201
386877792733
386874718860

(from completed items - all fairly recent, all around the £65 ish mark)

Ive not studied all of the above, so there may be oddities, but, again, the £70 (delivered) price is not uncommon.

 

[Onoff]

eg

386917310376
276413135201
386877792733
386874718860

(from completed items - all fairly recent, all around the £65 ish mark)

Ive not studied all of the above, so there may be oddities, but, again, the £70 (delivered) price is not uncommon.

Cheers. I was peed off tonight so went with one from Heating Parts Warehouse. Same place I ordered the filters from earlier today.

Riello RDB Oil Pump | 20030953 - Buy at H.P.W.

Riello RDB Oil Pump | 20030953 available to buy online, with fast tracked delivery. Click here to learn more on the product!

heatingpartswarehouse.co.uk

There's a circlip on the pump shaft I note. I'll have that off tomorrow and delve further.

 

[Onoff]

Success just now in getting one of the two pumps going with a homemade peg!

Think one pump is properly duff as in not getting up to pressure. A seal inside I guess.

I've figured a couple of things out about these pumps though that are really good to know. As why they go tight and how to fix it.

The two ring gears must sit a fraction lower than the face they sit in. Check with a straight edge up against a light source. Easily done by rubbing on some emery to take a gnats off. Otherwise the 3 hole cap plate can bind everything up when you put it on. Ditto the shaft end.

The burner motor has very little torque. If the pump jams it'll lock out. Once assembled and seeming turning freely, I put the pump shaft in the cordless drill chuck and gave it some beans in both directions whilst holding the pump in my hand. I reckon that knocks off any tiny burrs.

The peg (key), nom 9.5x3x2 mustn't be too tight a fit though the length is important. Needs a bit of slop.

A lad in NI sells 4 pegs for £12 on Ebay. CNC cut from carbon steel apparently.

https://flic.kr/p/2pJtKxG

Sods Law it'll stay working now I've got a new pump coming!

 

[carbon]

A seal inside I guess.

The only seal in these pumps is the gland seal on the drive shaft, a common failure on the fuel pumps I see is the pressure regulating valve jams in the housing and then there is no output. Remove the two larger fittings, the one with the pressure adjusting screw and the one on the opposite side of the pump that has the fuel outlet pipe connected to it. The pressure regulating valve if jammed will need some pressure applied to it rather than being able to push it out freely. Cleaning the valve and the bore in the body of the fuel pump may get fuel pressure back, but not always guaranteed.

 

[Onoff]

The only seal in these pumps is the gland seal on the drive shaft, a common failure on the fuel pumps I see is the pressure regulating valve jams in the housing and then there is no output. Remove the two larger fittings, the one with the pressure adjusting screw and the one on the opposite side of the pump that has the fuel outlet pipe connected to it. The pressure regulating valve if jammed will need some pressure applied to it rather than being able to push it out freely. Cleaning the valve and the bore in the body of the fuel pump may get fuel pressure back, but not always guaranteed.

I had the two large fittings out and withdrew the spring, all looked good but I cleaned everything anyway.

I think I can get hold of another RDB2 burner to play with the duff pump on the bench.

Just need a bench...