There is a large back story to this tractor in regards to what I've replaced, etc, but I'll try and keep this a little shorter otherwise my post will run for pages.
1960 Massey Ferguson 35 tractor with the 3A.152 Perkins 3 cylinder diesel, obviously this is the indirect injection version, also naturally aspirated.
Was purchased new by my grandfather and pretty much used and abused since then, no idea on the hours, except to say LOTS.
This engine has removable precombustion chamber covers on the side of the head, one for each cylinder, on the same side there are two exhaust ports. The exhaust ports exit between cyl #1 &2 and then again behind #3.
I've got what I believe to be a localised overheating issue caused by corrosion in the block leading to a coolant flow issue.
The temperature gauge sender is at the thermostat housing off to the front of #1 cyl. Gauge won't read due to not getting hot enough.
Infrared thermometer shows about 50c, therefore thermostat won't open, it is currently removed to allow coolant flow through radiator.
5 minutes at 1200 rpm from cold will show temps on the precombustion chamber covers of #1 45C #2 75C #3 95C.
With thermostat removed coolant is flowing, with thermostat installed it's not opening and obviously bypassing.
So my question is,
Is the precombustion cover temp giving me a indication of cylinder temps or head coolant temps or a combination of both?
I'm confused by the large variations in temps, there's not much free space to measure directly off the head, but in front of #1 is pretty much same as precomp temp whereas between #2 & #3 is in the 80C if run for longer.
I measured under a load and got approx #1 55C #2 120C #3 140C.
As stated I'm leaning towards blaming coolant flow through block for getting the rear two cylinders hot, but I've got a nagging little voice saying maybe I'm measuring combustion temps and it's a fuel issue.
Head is new, waterpump is new, injectors rebuilt and pop-off pressure set, radiator is clean, hoses new, thermostat when installed was new and verified opening on stovetop. New fuel lift pump, filters, injector pump timing checked (was correct), #2 compression 360psi, other two 380-390ish. Good oil pressure
I keep blowing head gaskets, on #3, where my heat appears to be. I haven't simply shotgunned the new parts, every time I done a head gasket I found what I thought was the problem and fixed it, and while each of those was definitely buggered, it appears that heat is the underlying issue.
Just trying to figure out why.
There is more, but as I said, trying to keep this a little bit shorter than war and peace.
Thanks
1960 Massey Ferguson 35 tractor with the 3A.152 Perkins 3 cylinder diesel, obviously this is the indirect injection version, also naturally aspirated.
Was purchased new by my grandfather and pretty much used and abused since then, no idea on the hours, except to say LOTS.
This engine has removable precombustion chamber covers on the side of the head, one for each cylinder, on the same side there are two exhaust ports. The exhaust ports exit between cyl #1 &2 and then again behind #3.
I've got what I believe to be a localised overheating issue caused by corrosion in the block leading to a coolant flow issue.
The temperature gauge sender is at the thermostat housing off to the front of #1 cyl. Gauge won't read due to not getting hot enough.
Infrared thermometer shows about 50c, therefore thermostat won't open, it is currently removed to allow coolant flow through radiator.
5 minutes at 1200 rpm from cold will show temps on the precombustion chamber covers of #1 45C #2 75C #3 95C.
With thermostat removed coolant is flowing, with thermostat installed it's not opening and obviously bypassing.
So my question is,
Is the precombustion cover temp giving me a indication of cylinder temps or head coolant temps or a combination of both?
I'm confused by the large variations in temps, there's not much free space to measure directly off the head, but in front of #1 is pretty much same as precomp temp whereas between #2 & #3 is in the 80C if run for longer.
I measured under a load and got approx #1 55C #2 120C #3 140C.
As stated I'm leaning towards blaming coolant flow through block for getting the rear two cylinders hot, but I've got a nagging little voice saying maybe I'm measuring combustion temps and it's a fuel issue.
Head is new, waterpump is new, injectors rebuilt and pop-off pressure set, radiator is clean, hoses new, thermostat when installed was new and verified opening on stovetop. New fuel lift pump, filters, injector pump timing checked (was correct), #2 compression 360psi, other two 380-390ish. Good oil pressure
I keep blowing head gaskets, on #3, where my heat appears to be. I haven't simply shotgunned the new parts, every time I done a head gasket I found what I thought was the problem and fixed it, and while each of those was definitely buggered, it appears that heat is the underlying issue.
Just trying to figure out why.
There is more, but as I said, trying to keep this a little bit shorter than war and peace.
Thanks