Description
Exhaust Manifold Studs 5/16" Inch UNC/ UNF x 1.11/16 | MG, Ford | Qty: 20
- Stud Type: UNC/ UNF
- Overall Length: 41mm
- Thread Pitch: 5/16" UNC
- Suitable for: MGB, MG, Ford
- Long Lasting & Durable
- Pack of 20
Stud Size & Fit:
These Imperial exhaust manifold studs are for the direct replacement of rusted or damaged studs. Exact fits can be ensured by reviewing the data sheet attached which includes precise stud measurements. Over their lifecycle manifold bolts expand and contract due to exhaust heating and cooling. Over the years they can become worn and damaged and need replacing.
TECHNICAL DATA SHEET/ STUD SIZES
We also have Great Deals on:
UNC / UNF Thread Type:
UNC and UNF are the two main categories of unified thread standard. For a given nut size of nominal diameter, Unified Fine Pitch (UNF) and Unified Coarse Pitch (UNC) represent two different thread densities. UNC is the most commonly used. The choice of UNC versus UNF is influenced by the specific application of the job at hand and each type delivers different advantages.
UNC - coarse threads are more durable and have greater resistance to stripping and cross-threading. They are also less susceptible to being nicked or damaged and therefore they do not have to be "handled delicatley" compared to fine thread (UNF) nuts. Coarse nuts install much more quickly and are not not affected by plating buildup to the same extent as fine UNF threads.
UNF - fine threaded bolts are stronger than UNC coarse threaded bolts of the same hardness. This is due to the fine threaded bolts having a slightly larger tensile stress area. Fine threads also have less tendency to loosen under vibration due to the fact that they have a smaller helix angle than coarse threads.
UNF also has the advantage of allowing for finer adjustments in applications that require this characteristic. They can also be more easily tapped into difficult to tap materials and thin walled sections and they require less tightening torque to achieve equivalent preloads to the corresponding UNC nuts/ bolts.
Manifold Stud Degradation:
Manifold studs are exposed to extreme engine temperatures for prolonged periods of time. Removing them can be a near impossible task. Corrosion and rust can fuse the exhaust manifold studs on older vehicles.
Whether it’s to replace the manifold itself or to get at other parts inside your engine the bolts will have to be removed. When your exhaust manifold studs are stuck, try these tricks to get them off.
How To Remove Exhaust Manifold Studs:
Step 1 - Hammer Time
Gentle coaxing with a hammer. A couple of careful firm taps is it all it takes. A gentle hammering should break the seal that rust has created between the bolts and the engine block. Don't hit the stud too hard incase you bend it.
Step 2 - Leverage
When it comes to a stuck nut - it's a good idea to add a length of iron pipe to your wrench for some additional leverage to deliver extra torque. The longer the handle the greater the torque. More torque makes it easier to loosen the stud.
Step 3 - Silicone Lubricant
At this stage it is best to apply some industrial strength Silicone Lubricant Spray. This does a great job on freeing up bolts that have been seized by rust and corrosion. Direct the spray in between the exhaust manifold stud and the engine block. Don't spray the bolt head. For best results you should let the lube get to work over night.
Step 4 - Block Heating
If you experience problems loosening the bolt inside the engine block, then you can try loosening the engine block around the bolt. You can use a hand held torch to heat the engine block around the exhaust manifold. This will expand the stud casing and generate wiggle room. Note, you will need to let the engine block cool before repeating the process for the next bolt.
Step 5 - Fire and Ice
A quicker process involves heating the exhaust manifold bolt itself and then cooling it quickly. You can effect this method by applying a torch directly to the bolt head to heat the stud as rapidly as possible without altering shape. Next apply an ice cube, (using tongs), directly onto the bolt head. Then repeat this with a second ice cube. The rapid loss of heat will result in a contraction/ change of size and break the rust seal that had formed.
Shop Today!
Grease Monkey Direct serving Britain, The UK and Northern Ireland. To browse and purchase more products and view our current discounted, for sale and clearance offers please go to the GreaseMonkeyDirect.com home page.
Payment & Security
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Refund Policy
Returns
Our policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange.
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.
Several types of goods are exempt from being returned. Perishable goods such as food, flowers, newspapers or magazines cannot be returned. We also do not accept products that are intimate or sanitary goods, hazardous materials, or flammable liquids or gases.
Additional non-returnable items:
Gift cards
Downloadable software products
Some health and personal care items
To complete your return, we require a receipt or proof of purchase.
Please do not send your purchase back to the manufacturer.
There are certain situations where only partial refunds are granted (if applicable)
Book with obvious signs of use
CD, DVD, VHS tape, software, video game, cassette tape, or vinyl record that has been opened
Any item not in its original condition, is damaged or missing parts for reasons not due to our error
Any item that is returned more than 30 days after delivery
Refunds (if applicable)
Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.
If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.
Late or missing refunds (if applicable)
If you haven’t received a refund yet, first check your bank account again.
Then contact your credit card company, it may take some time before your refund is officially posted.
Next contact your bank. There is often some processing time before a refund is posted.
If you’ve done all of this and you still have not received your refund yet, please contact us at abconeill@gmail.com.
Sale items (if applicable)
Only regular priced items may be refunded, unfortunately sale items cannot be refunded.
Exchanges (if applicable)
We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at abconeill@gmail.com and send your item to: Unit 10, Teemore business Complex Co. Fermanagh GB BT92 9BL.
Gifts
If the item was marked as a gift when purchased and shipped directly to you, you’ll receive a gift credit for the value of your return. Once the returned item is received, a gift certificate will be mailed to you.
If the item wasn’t marked as a gift when purchased, or the gift giver had the order shipped to themselves to give to you later, we will send a refund to the gift giver and he will find out about your return.
Shipping
To return your product, you should mail your product to: Grease Monkey, Unit 10, Teemore business Complex Co. Fermanagh GB BT92 9BL
You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.
Depending on where you live, the time it may take for your exchanged product to reach you, may vary.
If you are shipping an item over £75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.