I have a MCI102c3 6v92 Mechanical with a HT740 Trans. How do I determine if I have Jake Brakes? I have the switch on the dash but I don't know how to verify if I have jake's.
First see if the engine has the tall valve covers. If it has the tall valve covers look for the small single wire coming out of each head going to the engine governor for the cut off switch. Finally, pull one of the valve covers to see if you have the Jake units mounted above the rocker arms. Most likely, you have an electrical problem. Good Luck, TomC
I made a journey out into the snow drifts to look at my valve covers. I don't believe I have the tall covers and I didn't see a wire. However, I was only able to see the passenger side cover because the other side of the bus is covered by a snow drift. I included a couple of pics to verify. If I don't have jakes I wonder why I would have a switch at the date? How much would Jakes cost?
There could have been jakes on previous engine that was replaced with this one. Someone started to get ready to install jakes, but didn't get past switch and wiring.
Quote from: chessie4905 on March 04, 2019, 01:35:52 PM
There could have been jakes on previous engine that was replaced with this one. Someone started to get ready to install jakes, but didn't get past switch and wiring.
Could be exactly that - our bus has a switch installed and is waiting for a trip to the shop for the Jake install. Someone buying the bus right now would be asking the same questions you're asking. Wiring was already in place in the OEM harness from the factory and only required adding a few parts (relay, CB, etc.), and I bet you have something in your harness similar if Jakes were a factory option.
Cost? I spent about $1500 to round up all the necessary parts. Maybe a little more when you include the relays, switch, paint for the new valve covers, etc. Still will have to purchase the rebuild kits for the Jakes so they can be installed fresh, and then there is the labor cost if you're not doing the work yourself. Most of the parts are available, but you may have to search a bit for them.
Watch on Ebay. They come up all the time. Be patient. The buffer switch is costly. Plan on getting rebuild kits for the jake solenoids and youll need new fuel crossover lines and it is recommended to go with the new oring style which require different stands to be compatible with oring type, plus they need longer hold down bolts. Try to get a complete set with all the small items included. 92 and 71 series are different. I believe marked 71-92 is what to look for.
Here's a picture of a Jacob unit...
Those are not Jake valve covers he has the non Jake Covers
Richard, do you know of a good bus shop in Wisconsin?
Would 8v92 silver series jakes fit a 6v92? Is there a model number for the jakes that I should search for?
Sent you a PM.
6v92 and 8v92 use the same except you have one master on each side with 2 slave on each bank and different valves covers
Luvrbus, I just sent you a PM.
Quote from: luvrbus on March 04, 2019, 07:00:34 PM
6v92 and 8v92 use the same except you have one master on each side with 2 slave on each bank and different valves covers
Does anyone have a pic of the tall valve covers?
Do these look like the tall covers?
Quote from: luvrbus on March 04, 2019, 05:37:09 PM
Those are not Jake valve covers he has the non Jake Covers
The tall covers for Jakes are not symmetrical - one side is has slightly different angles than the other.
If you look at the pictures about 3/4 the way down, you can get a great view of the tall covers. Even though this is an 8v-71 they are the same, just shorter. When you locate a set make sure breather locations will work. This article is good reading too.
https://i1.wp.com/www.technomadia.com/uploads//2013/08/Cherie-Head-Engine.jpg
Good point on the breather locations. DD did make filler plates for the breather holes - they can be used to close off any holes that you don't need or that are in the wrong place. If you're lucky you won't need them, but if you hunt around you should be able to find a shop with some filler plates/gaskets. I had to do that on one of the valve covers going on our 8V71 soon.
Does anyone know what the serial number of the jake brake 6v92ta valve covers?
You don't want to pay retail price for them. They are costly. Watch Ebay or maybe Cliff has some. I thought he did at one time.
Try calling Central Truck Service in Minneapolis MN. That's where I found most of my Jake parts. You can also try C&J Bus Service in Minneapolis MN.
If my memory is correct, Central Truck sells used engine parts. They were able to put together a nearly complete Jake setup for my 8V71 last year.
Richard
Thanks for giving me the referral to central truck. They think they have everything I need. We also talked about a possible overhaul and they said they do a bunch of 2 stroke diesels each year and are very familiar with the engine. So perhaps if I do an overhaul that might be a good option.
Quote from: richard5933 on March 07, 2019, 05:53:53 AM
Try calling Central Truck Service in Minneapolis MN. That's where I found most of my Jake parts. You can also try C&J Bus Service in Minneapolis MN.
If my memory is correct, Central Truck sells used engine parts. They were able to put together a nearly complete Jake setup for my 8V71 last year.
Glad it worked out. They were quite helpful for me. If there is anything they don't have, be sure to ask for suggestions from them where to get it - they seem to have a pretty tight network of related shops.