New Sierra 18-1956-2 marine exhaust manifold for 1983 to 1989 MerCruiser 2.5L and 3.0L marine gas 4-cylinder engines. MerCarb carburetor. See cross reference below to determine if this will replace your existing manifold. Comes with gasket set and additional accessories seen in product photo.
This manifold is new and is cast iron construction. For tips on replacing exhaust manifolds and risers, see my eBay guide
. To determine if this is the correct replacement for you, look on your current manifold for casting numbers and match them to the cross-reference below:
|Cross Reference||Part Number|
|MerCruiser||99798A3, 99798A9, 99798A16, 860235A04|
View the Sierra online catalog
for part numbers, descriptions, and application fitment on over 6,000 marine parts. If you have an OEM or aftermarket part number you're trying to replace, you can use the Sierra SONAR part number lookup
to find the correct Sierra part for your application.
Search all of my other Sierra items here
If the part numbers and information above aren't enough to determine fitment, you can contact Sierra's Tech Support Line
directly via email or phone.
Sierra products are engineered to meet or exceed OEM standards, and stand up in harsh marine environments. Every new Sierra part comes with a limited lifetime warranty
that covers the useful life of the product against any defects in workmanship and materials. The warranty does not cover normal wear and tear.
Shipping and Tracking
- Items ship the same day if purchased on a business day before 10am Pacific Time.
- Tracking is emailed to your eBay email address once an item ships (double-check your spam folder).
- Faster shipping options are available in the "Shipping and payments" section on this page.
- Business days are Monday to Friday, not including holidays.
- Pickup is not available. All items must be shipped.
- US Sales tax is charged to Washington state addresses only.
- International buyers may have import duties/taxes (see below).
- Items heading outside the USA cannot be used for military or government applications. The seller and marketplace expressly disclaim liability for misuse of its products.
- Shipping prices shown do not include import taxes or customs duties. Contact your country's customs department for more information.
- Items cannot be marked as gift or have a lowered value on the documentation. It is unlawful to forge international documents.
Warranty and Returns
This item has a Limited lifetime warranty covering any manufacturer defects. Defective items are generally replaced within a few business days, plus time in transit, and there will never be any extra cost to you.
For Lost Items, Damage, or Other Problems
If your item was damaged, incorrect, lost, or is missing parts, please send an eBay Message or Email right away. Describe the nature of the problem and its urgency (include pictures if possible). You will be taken care of as quickly as possible and there will never be any additional cost to you.
For Regular Returns
You may return an item if you no longer need it or don't want it anymore. Returns are accepted on items still in the same condition they arrived in. There may be a 10-15% restocking fee and all shipping costs must be covered by the buyer. To initiate a return, log in to eBay, go to your Purchase History, and use the Return link next to the transaction.
Frequently Asked Questions
Q: Who manufactures this item?
This item is manufactured by Sierra.
Q. What are the shipping dimensions and weight?
This item ships in a box approximately 25" x 12" x 8" and weighs approximately 50 lbs.
Please read the information above thoroughly before asking a question. Questions are answered Monday through Friday, 8am to 4pm PST. All correspondence must be via Email or eBay Message. Use the Ask a question button below to ask a question.