Iseki TS1910

[Paul2]

I just bought a TS1910. I am servicing various things and was looking to check/replace thermostat. Removed upper radiator hose housing(4bolts) and found where thermo should be(I think), but there is not one there. Does anyone know where I can get a thermostat, or is there a cross-over part available at the local auto parts store. Help!! Thanks.

 

[larso1]

Hello,
I've got basically the same Iseki model, the TS1610, and there is no thermostat or housing originally installed on these. Maybe because they only operate in warmer weather in Japan? Anyway, the equivalent Bolens Iseki models sold in the US, the G192 and G194, do have a thermostat housing at the top hose on the block that includes a bypass. If you can get ahold of one of these it will bolt right on I believe. The alternative I've been looking into is an in-line type housing that can be cut into the hose. E-bay has many listings for thermostat housings (with thermostat) that start at $1.00 and go up to $100.0 depending on the vehicle. Most are flange mount that bolt to the block, but there are several that are separate in-line type. Especially for water-cooled motorcycles... but their hose connections are too small. You need about a 1-3/8" OD hose connection I believe. The bike types are closer to 3/4" O.D. Hope this helps.

Bill

 

[v8dave]

If you put a thermostat in with out a bybass housing make sure the thermostat has a small hole (say about 1/16" or so) in the thermostat plate. In other words a hole to let water flow past the thermostat when it's closed. This is needed so there is some water flow past the thermostsat to heat it up so it'll open as warmer water passes by. No water flow and it'll take too long for the thermostat to get warm.

You may see a small hole already punched in the plate, if so this should be adequate size.

 

[larso1]

Good point Dave. I notice most of the American V-8's appear to have no bypass so I assume they all flow a small amount through the stat when closed. Seems a lot simpler than a separate bypass circuit with its added hose and fittings. But I also wonder if some engine water pumps aren't designed to operate at very small flows (cavitation, etc.) and instead require the by-pass to maintain nearly constant flow.

I will also add that the Bolens Iseki manual states that the stock thermostat opens between 166- and 173-deg.F. and recommends that the motor should be warmed up from 5 to 10 minutes at idle before working it.

Bill

 

[v8dave]

I was aware of the hole in the thermostat from my Flathead V8 work (the V8 in v8dave). Flathead V8s have two water pumps and the early model engines (1932 to 1938) had no thermostats. Later flathead models (1946 to 1953) did have thermostats without a bypass (I'm not sure about the '39 to '42 models). The thermostats used in the later flathead cars had small holes in the base plate. The water pumps in these old engines can run blocked without cavaitation problems, they are a fairly simple design with few straight blades and lots of clearance in the pump.

I'd guess that later model cars with their close tolerance swept blade pumps can't cope with blocked flow and will probably stall and cavitate accelerating blade wear in the pump.

 

[Paul2]

Thanks for your reply. The housing on my tractor, if you could call it that, is a flat piece of steel held by 4 bolts with a single outlet to the upper radiator hose. The temperature sensor screws into the housing also. The reason I thought there was a thermostat is because the back side of the outlet has a bevel cut into it that looks like it would hold a thermostat, although a very small one. I hit the auto parts stores today without luck. No one has a thermostat that small. Monday I'm going to try the local Honda motorcycle dealer. Maybe they'll have one small enough.

 

[larso1]

The housing on the Bolens model looks a lot larger than the flange and tube arrangement on ours, big enough to accept a normal sized t-stat. I would worry about impeding flow with a small t-stat, if you could even get it to seal watertight..

Bill

 

[v8dave]

Paul, fill out your profile so we can know where you are at.

Unless it gets below freezing where you are and you are going to operate the tractor in those temps, it might be easier to just forget the thermostat.

 

[Slamfire]

</font><font color="blue" class="small">( I was aware of the hole in the thermostat from my Flathead V8 work (the V8 in v8dave). Flathead V8s have two water pumps and the early model engines (1932 to 1938) had no thermostats. Later flathead models (1946 to 1953) did have thermostats without a bypass (I'm not sure about the '39 to '42 models). The thermostats used in the later flathead cars had small holes in the base plate. The water pumps in these old engines can run blocked without cavaitation problems, they are a fairly simple design with few straight blades and lots of clearance in the pump.

I'd guess that later model cars with their close tolerance swept blade pumps can't cope with blocked flow and will probably stall and cavitate accelerating blade wear in the pump. )</font>

The '39s were the first of the later style. /forums/images/graemlins/wink.gif

 

[Paul2]

Thanks to all for the help with my TS1910. The concensus, after a number of calls, was that there was no thermostat installed. So I'm buttoning it up and getting ready to put it back in service. Thanks again.