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4 cyl perkins only firing on two cylinders at idle?
MFSuper90 Offline
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#1
4 cyl perkins only firing on two cylinders at idle?
I have a 318 perkins in my "farm stock" pulling tractor. It has been bored and stroked to be almost 390 ci, also has a ground cam in it from crower. No head work except the angles on the valve have been touched up.

When at idle cylinders 1 & 2 do not fire, but when it is at WOT it runs fine? Confused

Any input is greatly appreciated.
'82 300D -3" straight pipe, ALDA deleted, 3in1 glowshift gauge, HX30, egr-less manifold, A/W intercooler Big Grin
'14 Ram 6.7l cummins -G56 handshaker, wishing it was deleted         
05-15-2011, 12:57 PM
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dieselboy Offline
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#2
RE: 4 cyl perkins only firing on two cylinders at idle?
Id pull a injector line off a missing cylinder and do a ghetto jar timed cc test and compatr it ti a good cylinder If they are close then pop test the injectors.

Ve or inline pump?
-Jesse

80 300sd hy35, front mount intercooler, w115 intake, rack limiter removed, Alda removed, full load turned up, boost, ebp, trans, pyro, egr delete, 3.5" exhaust, e-fan, 16x8 rims with, 245/50 tires, lowered, bilstien 5100's, 12" front brakes, 2.65:1 diff.
97 f250 psd 4x4, crawler
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05-15-2011, 06:30 PM
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MFSuper90 Offline
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#3
RE: 4 cyl perkins only firing on two cylinders at idle?
(05-15-2011, 06:30 PM)dieselboy Wrote: Ve or inline pump?

Lucas CAV Ve. Stock pump, but the injectors are laser cut 8 hole, not sure what size. It would be a good idea to test injectors.
The guy that does our pump work said he has seen this happen to engines where the valves in the cylinder head are not all seated equally (at the same depth)? Huh

Thanks for the input Smile
'82 300D -3" straight pipe, ALDA deleted, 3in1 glowshift gauge, HX30, egr-less manifold, A/W intercooler Big Grin
'14 Ram 6.7l cummins -G56 handshaker, wishing it was deleted         
05-15-2011, 07:45 PM
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HoleshotHolset Offline
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#4
RE: 4 cyl perkins only firing on two cylinders at idle?
(05-15-2011, 12:57 PM)MFSuper90 Wrote: When at idle cylinders 1 & 2 do not fire, but when it is at WOT it runs fine? Confused

It's a pulling tractor, it's supposed to idle funny and then run like a recently violated primate at WOT... Big Grin

Beers,

Matt

'07 W211 OM642
'95 W124.131/722.435, 211k - daily driver/Superturbo project - OM606.962 with "M" pump...under construction! (build thread here)
'99 W210.025 - gone, but not forgotten
'94 Dodge/Cummins - gone, but not forgotten
05-16-2011, 09:28 AM
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MFSuper90 Offline
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#5
RE: 4 cyl perkins only firing on two cylinders at idle?
(05-16-2011, 09:28 AM)HoleshotHolset Wrote: It's a pulling tractor, it's supposed to idle funny and then run like a recently violated primate at WOT... Big Grin

Hahahaha Tongue yes, but not firing at all on the front two isnt healthy. I only wish my cam was that big Wink

'82 300D -3" straight pipe, ALDA deleted, 3in1 glowshift gauge, HX30, egr-less manifold, A/W intercooler Big Grin
'14 Ram 6.7l cummins -G56 handshaker, wishing it was deleted         
05-16-2011, 01:56 PM
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Biohazard Offline
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#6
RE: 4 cyl perkins only firing on two cylinders at idle?
recently violated primate... Jebus, I'm gonna steal that line from you. LOL My coworker was looking at me funny when I started laughing over here!

Have you checked leakdown on the cylinders?
82 300SD aka The Flyin Pumpkin (Gone): 7.5mm super M-pump, T3 60 trim turbo, Coldish air intake, A/W intercooler, propane injection, SW Boost and EGT gauges, Monark 265 nozzles, ported/polished cylinder head.

84 Euro 300D 4 sp: White with black trunk and hood. Blue cloth interior. Manual everything. 300DT front swaybar. C320 17" wheels. Now with the Flyin Pumpkins engine! 
05-16-2011, 07:32 PM
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MFSuper90 Offline
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#7
RE: 4 cyl perkins only firing on two cylinders at idle?
(05-16-2011, 07:32 PM)Biohazard Wrote: Have you checked leakdown on the cylinders?

Unless the rings did not seat up correctly there shouldnt be hardly any considering we just built this engine about a year ago.
but i suppose it wouldnt hurt to check Tongue
thanks for everyones input Smile
'82 300D -3" straight pipe, ALDA deleted, 3in1 glowshift gauge, HX30, egr-less manifold, A/W intercooler Big Grin
'14 Ram 6.7l cummins -G56 handshaker, wishing it was deleted         
05-16-2011, 08:19 PM
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john Offline
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#8
RE: 4 cyl perkins only firing on two cylinders at idle?
i think they have some strange prechambers where some things can come loose? Then it dont run on all cylinders when cold
Holset power!
01-11-2014, 09:16 PM
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MFSuper90 Offline
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#9
RE: 4 cyl perkins only firing on two cylinders at idle?
John, It's direct injection.
As after I converted it to a VE pump it helped with the miss some.
But I think it's mainly from the big cam and wild timing
'82 300D -3" straight pipe, ALDA deleted, 3in1 glowshift gauge, HX30, egr-less manifold, A/W intercooler Big Grin
'14 Ram 6.7l cummins -G56 handshaker, wishing it was deleted         
01-13-2014, 08:41 PM
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hansendk Offline
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#10
RE: 4 cyl perkins only firing on two cylinders at idle?
well its some time since I played with 4.318 but for me it sounds like the valves have you checked the valve clearance if you run std exhaust valves the beating and heat can make so the valves are going up in the head so there is no compression when its idle but at rpm they are forced up so it running on all 4
is it worse when its hot then its a possibility
I have seen it on a lot on old tractors where nobody have adjusted the valves for decades symptom to look for it more difficult to start when its hot.
01-15-2014, 07:35 AM
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MFSuper90 Offline
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#11
RE: 4 cyl perkins only firing on two cylinders at idle?
Hansendlk, you were correct partially correct. Two valve were sunk into the head not seating correctly and the port job that was done had a pinhole in the intake side cause it to suck a tiny bit of coolant in the cylinder. And it had two bad injectors. I just got all this taken apart and check the past month or two lol.

It's changed some though, now it has a Bosch VE on it and I just fabbed up a Borg Warner s257sxe on it, waiting for my injectors to come back now...
'82 300D -3" straight pipe, ALDA deleted, 3in1 glowshift gauge, HX30, egr-less manifold, A/W intercooler Big Grin
'14 Ram 6.7l cummins -G56 handshaker, wishing it was deleted         
03-08-2016, 06:48 PM
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