Need some torque specs

[FarmGeezer]

I have a verticle V-Twin 20 HP. Model # 351777-0036-01. It was pushing raw gas out of the carb and running only on 1 cyl. It's got a lot of hard hrs. on it so I pulled the heads. Nothing definitive but I'm doing a valve job. It's ready to go back together and I need the head bolt torque if possible. It has the thin metal head gaskets and since there was no damage or kinks in them I'm going to clean them up and use copper coat gasket sealer. the stem seals will be replaced and I'll make my own rocker gaskets.

Regards,

FarmGeezer

 

[bertsmobile1]

I have a verticle V-Twin 20 HP. Model # 351777-0036-01. It was pushing raw gas out of the carb and running only on 1 cyl. It's got a lot of hard hrs. on it so I pulled the heads. Nothing definitive but I'm doing a valve job. It's ready to go back together and I need the head bolt torque if possible. It has the thin metal head gaskets and since there was no damage or kinks in them I'm going to clean them up and use copper coat gasket sealer. the stem seals will be replaced and I'll make my own rocker gaskets.

Regards,

FarmGeezer

Don't even think of refitting the old gaskets.
You have a 99% chance they will not seal properly
The gaskets are about $ 5.00 each

 

[reynoldston]

Don't even think of refitting the old gaskets.
You have a 99% chance they will not seal properly
The gaskets are about $ 5.00 each

I agree with this, but I have in the pass used old head gaskets over when I couldn't get a new one and have to say never had a problem doing so.

 

[Tinkerer200]

I agree with this, but I have in the pass used old head gaskets over when I couldn't get a new one and have to say never had a problem doing so.

That could sometimes be done with the old flathead engines. Trying to do it with today's OHV engines is very risky.

I can send you a Service Manual (Overhaul Manual) for your engine IF you like. Address below, put in proper format and remind me engine model number and what you want.

Walt Conner
wconner5 at frontier dot com

 

[FarmGeezer]

I used the old head gaskets and torqued the heads to 160 in. lbs.. Seems to run fine. I cleaned the old gaskets with a xtra fine scotch pad and used copper coat gasket spray. I made rocker cover gaskets from some gasket paper I got at the local parts store. Runs good , plenty of power and no oil leaks.

Regards,

FarmGeezer

 

[reynoldston]

I used the old head gaskets and torqued the heads to 160 in. lbs.. Seems to run fine. I cleaned the old gaskets with a xtra fine scotch pad and used copper coat gasket spray. I made rocker cover gaskets from some gasket paper I got at the local parts store. Runs good , plenty of power and no oil leaks.

Regards,

FarmGeezer

Most be that the head bolts can't be very large. 160 in lbs. because that is only a little less then 13.5 ft. lbs. Just doesn't seem very tight for head bolts? but I don't know the size. Runs good without any oil leaks can't get any better then that.

 

[FarmGeezer]

Well...it has a cast iron bore but the block and heads are aluminum. The head bolts are fine thread and I did not have the torque specs ( which was my original request that I got no answers for ) I got tired of trying to navigate thru the B&S web site ( it's a joke imho ) so I relied on a general torque spec chart I have for outboard engines ( aluminum blocks ) . The head bolts are 5/8 so I used the SWAG method after referring to the chart. It's not rocket science or a small block Chevy...

Regards,

FarmGeezer

 

[reynoldston]

Well...it has a cast iron bore but the block and heads are aluminum. The head bolts are fine thread and I did not have the torque specs ( which was my original request that I got no answers for ) I got tired of trying to navigate thru the B&S web site ( it's a joke imho ) so I relied on a general torque spec chart I have for outboard engines ( aluminum blocks ) . The head bolts are 5/8 so I used the SWAG method after referring to the chart. It's not rocket science or a small block Chevy...

Regards,

FarmGeezer

The very first thing is we need the make and model of the engine you are working on. This is the reason no one give you any specs. I am going to take a guess here and say you have metric bolts??? To get a torque specs we will need the proper bolt size not the wrench size. If you have 5/8 fine thread bolts holding that head down its something I have never come across in my years in the trade and you would be looking at 150 ft. lbs. or better. By any chance do you have a 20HP Briggs and Stratton in this mower? Toque bolts in two increments, first 200 in. lbs. and then 370 in lbs. This is just guessing as to what you have.

 

[FarmGeezer]

Thank you for your response. I stated that I torqued the head bolts to 160 in. lbs and this seems to be working fine. Yes the bolts are in fact metric I just used the 5/8 as a reference size. I reused the gaskets and they worked fine. It is a 20 hp B&S Model 351777 Type 0036-01. I may remove the rocker covers and re-torque the head bolts as directed by your post.

Again thanks for your reply.

Regards,

FarmGeezer

 

[reynoldston]

I have used the old head gaskets over in a pinch as I said. I just use the number 3 Permatex for the sealant. Nothing wrong with the way you did it. I am doing this work for customers and they expect quality work so I always use new gaskets when ever I can. Sometimes when on older equipment I can't find replacement parts I will have to use the old parts over again like head gaskets and make some of my gaskets. I would re torque your head bolts if I was you because you will end up blowing out a head gasket just when you need your mower the most and working it hard.