Home |
Search |
Today's Posts |
#1
|
|||
|
|||
Universal Diesel Idle
11hp, 2 cyl. Runs fine at speed and idles smoothly but it dies when
reversed at low speeds; and when speeding up from an idle it's very sluggish. What could be wrong? TIA, Tom |
#2
|
|||
|
|||
Hello Jay,
What have you checked? Air filter? Fuel filter? Time since last injector cleaning? Etc. Did the problem arise suddenly or has it been a gradual worsening? Need to do some homework. Chuck Jay Mott wrote: 11hp, 2 cyl. Runs fine at speed and idles smoothly but it dies when reversed at low speeds; and when speeding up from an idle it's very sluggish. What could be wrong? TIA, Tom |
#3
|
|||
|
|||
At what speed is it idling? Probably somewhere around 900 rpm is about
right? --Alan Gomes "Jay Mott" wrote in message ... 11hp, 2 cyl. Runs fine at speed and idles smoothly but it dies when reversed at low speeds; and when speeding up from an idle it's very sluggish. What could be wrong? TIA, Tom |
#4
|
|||
|
|||
Thank you.
The problem has increased over about a hundred hours. What are the chances that both injectors are fouled equally (idle is smooth)? How could it run at speed if the fuel filter is clogged? I don't think it has an air filter. Tom |
#5
|
|||
|
|||
There is no tachometer but it no longer idles consistently with the
lever all the way back. Tom |
#6
|
|||
|
|||
I'm certainly not an expert, but you might consider the following.
Torque is higher at higher rpms, lowest at idle. Anything that reduces the engine's power (valves in need of adjustment, for example) will reduce torque across the engine's range of rpms. At high rpms, you may have enough spare torque to propel the boat normally. When you accelerate, or shift to reverse (assuming you're moving forward at the time) you may find the torque is reduced enough to stall the engine, or at least to make it sluggish. Of course if you are at rest and shift into reverse, you would experience the same load as shifting into forward. Well, the prop would be running "backwards" and the transmission might use a different ratio for reverse. Maybe there is a difference. Bottom line: I would look at those things likely to reduce the overall performance of the engine. Regarding injectors, I can at least imagine a change in injector performance at different speeds. Someone more knowledgeable than I should be consulted. Good luck. Chuck Jay Mott wrote: Thank you. The problem has increased over about a hundred hours. What are the chances that both injectors are fouled equally (idle is smooth)? How could it run at speed if the fuel filter is clogged? I don't think it has an air filter. Tom |
#7
|
|||
|
|||
You didn't mention whether you were idling with the clutch engaged or in the
neutral position. If the problem appears only when the clutch is engaged, could it be something as simple as a badly fouled prop? That would explain the sluggish ramp-up to speed. "Jay Mott" wrote in message ... 11hp, 2 cyl. Runs fine at speed and idles smoothly but it dies when reversed at low speeds; and when speeding up from an idle it's very sluggish. What could be wrong? TIA, Tom |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
OT- Ode to Immigration | General | |||
Propeller pitch for Catalina 27 with Universal 18 (14HP) Diesel | Cruising | |||
Westerbeke vs Universal diesel | Cruising | |||
Diesel outboard? | Cruising | |||
Cooling water output - Universal 11hp/2cyl/ diesel ??? | Cruising |