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Old 23-05-2019, 10:29   #1
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Perkins 4.236 injector info (sought)

Hi All,

It is time to take a look at the injectors on my 4.236 Perkins. The search function does give some information....

I currently have all injectors of the same number - BKBL67S5299RY but I have not had them out yet to see what tip number they have.

My thought is to get 1 to 4 "new" ones, pull the old and have them rebuilt and then have spares.

I see a number of injectors advertised with the same part number but for a different engine. My engine is a LD 20663 U 763205 H

Questions abound.

What is a typical tip number used on the 4.236 with this body number?

What is a good source for rebuilding (in the USA) these injectors?

Tractor supply houses appear to have good prices - any downside?

Oh, and what does the RY indicate?

Of course general advise welcome.

Thanks
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Old 25-05-2019, 17:25   #2
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Re: Perkins 4.236 injector info (sought)

Can only give you general advice as don't know 4.236:
Tractor supply = same parts much cheaper than "marine " as a general rule.
Different model engines often use the same injectors so if they are the same no. they should be the same part.
Any injection shop should be able to rebuild for you but I'd price new 1st. Normally they'll replace nozzles & crushwashers
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Old 25-05-2019, 17:36   #3
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Re: Perkins 4.236 injector info (sought)

There is little difference in the injectors I found spares in a box in a service place in Malaysia Completely different number but in and working fine ! Don't think the older perkins are that fussy.
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Old 25-05-2019, 19:25   #4
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Re: Perkins 4.236 injector info (sought)

Thanks, I'm getting there in terms of understanding. True, the Perkins is not too fussy. So with injector pressure setting the time which the injector sprays having different pressures injectors ( a mis matched set) will cause timing issues.

I've been looking for a cross reference between the Delphi and Perkins number and pretty much found one. Lots to still understand better.

I am looking for an exact match of the injector number to add a 5th (spare) injector to the "set". Then have them all rebuilt together to the same spec.

Along those lines I am also looking into the injector pump. My 4.236 uses a CAV DPA 3248F451 which is quite common to the 4.236. It has a set code of PS61/850/4/2750.

From my research this appears to indicate that the:

total cm^3 is 61
The lower RPM is 850 (for timing?)
the spring position is 4
the high idle is 2800

This brings up some questions as that the max unloaded RPM measured is 2200.

Injector fault?
Pump Fault?
Air restriction Fault ( I do need to clean the air filter)?
Fuel supply fault?
Somebody set the Max RPM lower?

Lots to test and think about
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Old 13-06-2019, 12:39   #5
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Re: Perkins 4.236 injector info (sought)

I got a bit more info that I'll document here.

The injector pump is a PS61/850/4/2750

and as noted the 61 represent the total fuel pumped in cm^3 but here is the additional details. That is 61 cm^3 in 1000 squirts at 850 RPM. The 4 is the governor spring location and 2750 is the max no load RPM.

My engine would only rev to 2250 max RPM unloaded and the other day it would only go to 2000 RPM.

It turns out that the air cleaner (if you can call it that) was restricting air flow. Lots of gunk clogging the holes. That was cleaned up with some carb spray and we are back to 2250 RPM.

The service manual indicated that General Vehicle use has a rating of 82 hp at 2800 RPM, Industrial is 81 hp at 2600 RPM and Heavy Duty use is 72 hp at 2200 RPM

SO the injector pump rating indicates a max RPM of 2750. The throttle lever on the pump is wired in place to limit the maximum RPM.

I am guessing that Perkins put in injector pumps that were rated to go to 2750 (2800) RPM and then wired the throttle stop to a max RPM to suit the service. Heavy Duty for a sailboat engine at 2250.

This suggests that you could change the throttle stop and increase the actual max RPM up to the max rated RPM stamped on the fuel injector pump.

That or I've got a problem with one or more of the injectors or the pump.

Sometime this summer I'll have the injectors rebuilt and that will tell us if it is the injectors.

The engine runs smoothly so I suspect that there is no problem with the injectors....
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