Yanmar Thermostart

[pruntyc]

They may be bullet proof, but after using both, my opinion is that the thermostart system is not nearly as effective as glow plugs.
It is hard to compare the two, because no two tractors start exactly the same. Some will start with no help, at fairly low temps. and some will not. So I would guess, one is just as effective as the other, or the companys would only use the one way. Just my opinion of course, so one might be better than the other.

 

[gbirky]

Thanks for the info! I paid about $35 for a block heater, so I consider $75 very reasonable for the heater kit.

 

[JohnMiller3]

<A target="_blank" HREF=http://www.tractorbynet.com/forumfiles/49-223692-JD790AirintakeheaterMP29616________UN20AUG02.gif>Here's a picture of the thermostart system used on a JD790... so this would be Yanmar's current system...</A>

KEY PART NO. PART NAME QTY SERIAL NO. REMARKS
1 TY22472 CLAMP 2
2 HOSE 1
3 M803867 SCREW, WITH WASHER 2
4 M804346 HOSE GUARD 1
5 AM880590 HOSE 1
6 CH16778 THREADED NIPPLE 1
7 AIR CLEANER 1
8 RG25644 FILTER ELEMENT 1
9 RG60690 FILTER ELEMENT 1
10 M809535 COVER 1
KEY PART NO. PART NAME QTY SERIAL NO. REMARKS
11 RG60692 DRAIN VALVE 1
12 AM880591 AIR CLEANER 1
13 AT118553 AIR RESTRICTION INDICATOR 1
14 M805975 EXTENSION 1
15 19M7867 BOLT 9 M8 X 25
16 M802664 GASKET 1
17 CH19780 BOLT 1 M8 X 14
18 M810587 MUFFLER 1
19 14M7298 FLANGE NUT 1 M8
20 M802662 GASKET 1
KEY PART NO. PART NAME QTY SERIAL NO. REMARKS
21 M808645 STUD 1 M8 X 22
22 M808644 GASKET 1
23 CH12294 PIN 1
24 CH19092 BOLT 1 M8 X 105
25 M802596 STUD 2 M8 X 40
26 M89128 BOLT 4 M8 X 40
27 M810586 EXHAUST MANIFOLD 1
28 M808666 GASKET 1
29 M808640 INTAKE MANIFOLD 1
30 M805836 GASKET 1
KEY PART NO. PART NAME QTY SERIAL NO. REMARKS
31 M801118 HEATER 1
32 19M7897 BOLT 4 M8 X 35

 

[JohnMiller3]

<font color=blue>...I paid about $35 for a block heater...</font color=blue>

Used to go to Central Farm & Family and they'd have an assortment of block heaters on the rack... I'm guessing/remembering the avg. price ~ $12... /w3tcompact/icons/blush.gif

Now, Deere wants $55. for my block heater... /w3tcompact/icons/eyes.gif

I guess they call this inflation... /w3tcompact/icons/wink.gif

 

[EFC]

I replace more thermostarts than I do glow plugs, and there is a significant price difference. Haven’t found a Napa yet that couldn’t get me the glow plugs. Every other brand we pull out of the container I know will fire right up with glow plugs, I never know with Yanmars. I remember when I was trying to get my 1500 started in freezing weather pouring diesel in a little cup I didn’t think the idea was so cleaver.

 

[Inspector507]

According to the parts diagram, it should be Item #1.

 

[gbirky]

I know I probably could have gone the generic route, but what I got from Yanmar was really nice. I just took out a threaded plug in the side of the engine block, and replaced it with the heater. Now that I have one, I know what to look for. But I didn't want to have the tractor sitting without anti-freeze while I took the threaded plug to the store to look for one that would work. I bought the one that I knew would fit. Chances are, its the same one for your Deere. Yanmar parts are generally less expensive than Deere.

 

[gbirky]

JM3,
The intake manifold looks a bit different than I remember on my YM1301D, but it might be the same. I wonder what that one for the 790 would cost.

 

[JohnMiller3]

<font color=blue>...I wonder what that one for the 790 would cost...</font color=blue>

I don't have a kit price, but the heater alone is:

Part Details
Part Number:

M801118
Part Price: 52.83 USD
Description: HEATER

 

[Anonymous Poster]

The cheat on older models with the cup is to use a syringe to replace the cup, and squirt a bit of kero into the chamber.
The ultimate cheat is called brenz-O-Matic.

 

[duane]

Thanks for all the replies. My friend says starting his 1720D with and without the thermostart is night and day in very cold temperatures.
thanks
Duane

 

[gbirky]

I guess it depends on what you call very cold conditions. My YM1301D starts without it down to about 35 deg F. It starts pretty easily down to about 25 deg F using the thermostart. I haven't tried starting it at temps below 25 yet.

 

[MarkStewart]

What's the proper procedure for using the thermostart? How can I tell if mine is working properly? Is it difficult to fix? Thanks.

 

[Inspector507]

To see if it's working.........

Fill revervoir with fuel.
Remove air cleaner cover.
Turn key Counterclockwise and look into intake.
Smoke and then flame should appear if working.

Jerry