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Big Block Talk! Everything about swapping a big block engine into your cart! |
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03-23-2014, 03:12 PM | #1 |
Gone Wild
Join Date: Oct 2013
Posts: 462
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Thrown rod
Hey guys ive finally found some time to have a look at my engine.
Its a 16hp vanguard Everything was running just cherry until one day it just died on me. Ive been talking with 1989Marathon and he has been extremely helpful, thank you. Today I pulled my plugs again, had them cleaned so they looked better than new. Ran the engine for about 30 min and this is what they look like uploadfromtaptalk1395605370872.jpg Thought I'd go ahead and pull the valve covers while im at it. uploadfromtaptalk1395605418749.jpg Thrown rod and damaged rocker. The plug on the right belonged to the thrown rocker. The other side they looked intact so im still unsure why the plug is so fouled. I adjusted my carb per 1989Marathon's instructions. What do you guys suggest I do? My only real fear and hope is that I dont have to pull the **** engine.. it was such a PITA to install..... |
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03-23-2014, 03:29 PM | #2 |
Gone Wild
Join Date: Oct 2010
Posts: 6,730
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Re: Thrown rod
Can you push the valves open by hand? If so, it's not a big deal really. If not, there's trouble.
Is the rod bent? The plugs look like it's running a little fat, but I run mine that way for safety. Briggs made three different types of rockers for the Vanguard motors. You have the second generation. That type is the weakest of the three. The earliest version is the strongest. The heads had different mounting surfaces for the third generation. I would look for a set of first generation aluminum rockers/shafts. Here is a set, but they seem a little expensive. Rockers Here's what they look like. |
03-23-2014, 03:46 PM | #3 |
Gone Wild
Join Date: Oct 2013
Posts: 462
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Just checked. I can push them in by hand.
Also noticed that there is a steel and an aluminum one. uploadfromtaptalk1395607559189.jpg |
03-23-2014, 03:49 PM | #4 |
Gone Wild
Join Date: Oct 2010
Posts: 6,730
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Re: Thrown rod
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03-23-2014, 04:20 PM | #5 |
Gone Wild
Join Date: Oct 2013
Posts: 462
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No bent rods.
Before this the engine would get up to 5k without hesitation. Thanks for the link I emailed the guy about his rockers. Sent from my SAMSUNG-SGH-I337 using Tapatalk |
03-23-2014, 04:27 PM | #6 |
Gone Wild
Join Date: Oct 2010
Posts: 6,730
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Re: Thrown rod
Did you roll them on a flat surface, like a piece of glass to make sure.
If you have been running 5000 rpms without a rev-kit, you've been very lucky until now. Ask me how I know. At that rpm, the stock springs can't keep up as the cam is falling off, which allows the pushrod to come out of the rocker pocket. The rev-kit takes care of that issue. |
03-23-2014, 04:28 PM | #7 |
Searching for The Way
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,421
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Re: Thrown rod
5000 rpm without a rev kit....that's prob why it broke. I'm thinking you need to upgrade your valvetrain if you are running that kind of rpm regularly. Listen to 1989marathon, he knows....
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03-23-2014, 04:30 PM | #8 |
Gone Wild
Join Date: Oct 2010
Posts: 6,730
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Re: Thrown rod
Just a note to everyone...
When posting on that site, don't mention anything about using these parts in a golf cart. If you do, they won't even talk to you. They are very fearful of liability if someone gets hurt. |
03-23-2014, 04:33 PM | #9 |
Gone Wild
Join Date: Oct 2013
Posts: 462
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I havent rolled them but I think its just best to order the rev kit to be safe.
Can the rev kit be installed without pulling the engine? Thanks for the heads up, if the guy asks ill tell him its for my lawnmower 😎 Sent from my SAMSUNG-SGH-I337 using Tapatalk |
03-23-2014, 04:38 PM | #10 | |
Gone Wild
Join Date: Oct 2010
Posts: 6,730
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Re: Thrown rod
Quote:
The rev-kit will also come with a timing offset key. If you decide to use it, the flywheel can be removed while in the cart, unless you have something in the way. |
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