I have a fuel line rubbed through on my 11B engine. This is cylinder #1 and I have a Roosa-Master injection pump. It appears the rubber isolator in one of the clamps that affix this line to the cylinder head has rubbed through allowing metal to metal contact. I noticed hot, and unburned fuel smell and slight engine misfire while operating the tractor ultimately finding fuel dripping down the front of the engine timing cover. Going to need a replacement or have another built up.

Let me know if anyone has one.

Thanks,

DrAllis wrote: It's been a few years, but I've brazed lines like that before. Clean really good when done.

Thanks, I've brazed them also but don't know the extent of damage yet as cannot get into the engine compartment enough to see straight on. Going to remove the hood with a helper to further evaluate the compromise.

Turns out to not be an injector line but rather the engine is once again "making oil" and this dripping fuel is slinging off the crank dampener being pushed through the front oil seal. I pulled the dipstick and it's overfull and very clear smelling of fuel oil. No damage but probably the cup seals on the Roosa-Master pump are gone again.

Prior to my purchase this was a problem and the former owner had the pump rebuilt and installed it with the correct tool to compress the seals. However, he did not grease the bore of the brass sleeve, or seals with anything but fuel oil. I'm assuming this may have rolled a seal as the pump was pushed onto the driveshaft. He also told me they had to do a lot of "wrangling" to get the driveshaft to engage and fall into the drive slot of the rotor in the pump. They probably didn't put the engine on TDC prior to pulling the pump but I don't know this for certain. This all took place prior to my ownership so I'm third party but no experience, nor guidance was a player here. It is clear however where the fuel oil originates so need to replace the front timing cover oil seal and cup seals at a minimum in the pump. My borescope viewer clearly shows this but doesn't take photos so I can't relay what I've seen. I'll get the pump removed this next few days as have a spare set of seals and the seal tools as they came with the tractor purchase.

Forgot to update this. The former owner paid for the pump to be rebuilt but it wasn't rebuilt; only recalibrated but he was charged for a full rebuild. A former employee of the fuel shop I use did the work and has been long since terminated. I've known the owner a long time and have had him rebuild several pumps for me. When I carted this one in asking him to look it over as there is scarring in the brass pilot tube and mentioned it was rebuilt here, the serial number revealed the truth what went on through notes. Why he was charged for a full rebuild I don't know.

Long story short is the pump is rebuilt correctly now and awaits my pickup without charge including new seals and Stanadyne assembly lube.

You are right there. Don't know for certain but I think the owner paid a commission on work throughput of the shop when he had several employees. Could have been a contributor. I've known him over 30 years and he is not a dishonest man in my belief. 

The former owner told me the pump fueling was increased, (turned up) when it was rebuilt to about 160hp from the original 140hp delivery rating. That could have been true as the engine would bellow black smoke under a good push. It is now set back to original spec's with upgraded parts where some of the originals were worn from age.